3 2/5:x=6 4/5:1 1/3

17/5 / x = 34/5  / 4/3

34/5 x = 17/5 * 4/3

x= 17/5*4/3 * 5/34 = 1/2*4/3 

x=2/3

3 2/5:x=6 4/5:1 1/3
x*6 4/5=3 2/5*1 1/3           3 2/5*1 1/3=17/5*4/3=68/15
x*6 4/5=68/15
x=68/15:6 4/5                  68/15:6 4/5=68/15:34/5=68/15*5/34=2/3
x=2/3