Spanish
Spanish is the 4th spoken language in the world.
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By native speakers, the fourth most spoken language is Hindi. By total speakers, again, the fourth most spoken language is Hindi.
Hindi-Urdu
Mandarin. Spanish is like the fourth (I think) popular language in the world.
The third most spoken language in the world is Spanish.
Mandarin Chinese is the most spoken language in the world.
Mandarin is the most widely spoken language in the world.
Mandarin Chinese is the language with the most tones spoken in the world.
In 2014, the most spoken language in the world was Mandarin Chinese.
The language with the largest number of speakers is Mandarin. The language most widely spoken in the world is English.
English is the most widely spoken language in the world.