1 7/12
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Work below. :)
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First, find a common denominator. You can do so by listing the denominators' factors and finding a common number. (For the sake of space I'll skip).
1/2 = 6/12
3/4 = 9/12
1/3 = 4/12
Now, simply add the top numbers (aka numerator) but keep the denominator the same.
6 + 9 + 4 = 19
19/12 is an improper fraction, so make it proper.
1 7/12
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Good luck!
~pinetreee