Problem $4(30$ points$)$

Refer to the trapezoidal combined footing in figure below, with $Q_1=2016kN$ and $Q_2=1560kN.$ The distance between the columns $L_3$ is $5\mathrm{.}48m,$ and the net allowable soil pressure is $190$kPa. It is required to maintain $L_2$ as $0\mathrm{.}23m$ and $L_1$ as $0\mathrm{.}23m.$ Determine the values for $B_1$ and $B_2$ and draw the plan view of the footing with dimensions $($approximately to scale$).$