#### Find the missing number in the box $--$ in each of the proportions:$\frac{16}{36}=\frac{--}{63}=\frac{36}{--}=\frac{--}{117}$

Assume the missing number are x, y,z .

$\frac{16}{36}=\frac{x}{63}=\frac{36}{y}=\frac{z}{117}$
$\frac{x}{63} = \frac{16}{36}$

$x =\frac{16}{36} \times 63 = 28$

$\frac{36}{y} = \frac{16}{36}$

$y =\frac{36}{16} \times 36 = 81$

$\frac{z}{117} = \frac{16}{36}$

$z =\frac{16}{36} \times 117 = 52$

Hence, the missing number in box are 28, 81, 52.