That will depend on the plus or minus vallues of 15, 4, x and 9 which have not been given
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x/y = (9/4) / (3/5) = (9/4) * (5/3) = (9*5)/(4*3) = 45/12 = 15/4
8/15 x 9/4 = 1 1/5
x/5 = 9/15 15 x = 45 x = 3
3/5 x 5/12 x 4/15 = 3 x 5 x 4/5 x 12 x 15= 5 x (3 x 4)/5 x 12 x 15= 1/15
4/9 ÷ 11/5 = 4/9 x 5/11 = 4x5/9x11 = 20/99