Problem $5\mathrm{.}8.$C$.$ A $1018$ in$.$ beam of Douglas$-$fir larch, dense No$.1$ grade, is used for a $16-ft[4\mathrm{.}88m]span.$ The beam supports a uniformly distributed dead load of $1601\frac{b}{f}t[2\mathrm{.}33k\frac{N}{m}]$ and three concentrated live loads of $4$ kips $[17\mathrm{.}8$ kN $]$ each at the quarter points of the span $(4ft[1\mathrm{.}22m]$ on center$).$ Is the beam safe with respect to shear?