Determine the value of $Q$ of the Transverse Shear Stress formula $=\frac{VQ}{It}$ at the point of vertical

height $90mm$ from $x-$axis in $m{m}^3$ for the cross section shown in Figure $5\mathrm{.}2$a$.$

Given $B=450mm,D=150mm,t_f=24mm,t_w=37\mathrm{.}5mm$ and location of centroid from $x-$axis $=111\mathrm{.}607$

$mm.$