Assuming that "forth" is your attempt to spell fourths, the answer is eleven and two fifths.
1
They add to: 4 and 1/5
I think it's 1 and 2/5
2 and 6/5 or 3 and 1/5
3
2/5 + 1/5 = 3/5
1 and 1/2
17/30
2/5 + 4/5 = 6/5 or 1 1/5
2/5 + 1/5 = 3/5
4/5 plus 2/10 = 1