foolish,the best thing is that you don't learn anything if you have to ask such stupid things.:P
Yonghu007's answer is:
If you are a native English-speaker exceling in your area of profession, Japanese and Mandarin Chinese should be good choices. That makes 3 languages. If I must name a 4th then I am much less sure - could be one of the major European languages.
In South and Central America, the most useful languages are Spanish and Brazilian Portuguese. In North America the most useful languages are English, followed by Spanish and French
The most useful programming languages to learn for video game development would be C and C++ if you are looking to program on consoles and PCs.
The more languages you can learn, the better it is for you. Spanish is one of most spoken languages on the world nowadays.
The next two most useful languages to learn in the United States would be Mandarin Chinese and French. Mandarin Chinese is the most spoken language in the world and is increasingly important for business and cultural exchange. French is also widely spoken globally and is an official language of many international organizations.
In South and Central America, the most useful languages are Spanish and Brazilian Portuguese. In North America the most useful languages are English, followed by Spanish and French
Mandarin (Chinese) English Hindi Spanish
MandarinEnglishSpanishHindi-Urdu
There are not four languages there are hundreds
The only way a person can learn fluent from birth is been around a lot of different languages. It is not easy learning different languages.
The number of languages an average person can realistically learn varies, but most people can become proficient in 2-3 languages with consistent effort and practice. Learning additional languages beyond this may become more challenging.
Do you mean the four most popular languages in the world? That would be Mandarin Chinese, Spanish, English, and Arabic, in order.
The Rosetta Stone offers many languages with the most popular being French and Spanish, as well as special characters for those wanting to learn latin.