1/3+1/4+3/17 how do i do this fraction?

Find a common denominator:  3 x 4 x 17  =  204

Write each of the fractions with this denominator:  

1/3  =  (1 x 4 x 17) / (3 x 4 x17)  =  68/204        Multiply both the numerator and denominator by 4 x 17.

1/4  =  (1 x 3 x 17) / (3 x 4 x 17)  =  51/204       Multiply both the numerator and denominator by 3 x 17.

3/17  =  (3 x 3 x 4) / (3 x 4 x 17)  =  36/204       Multiply both the numerator and denominator by 3 x 4.

1/3 + 1/4 + 3/17  =  68/204 + 51/204 + 36/204  =  (68 + 51 + 36)/204  =  155/204