A $S1231\mathrm{.}8$ shaped beam is loaded as shown above. What is the maximum value of the principal stress at the junction of a flange and the web. The beam has the following lengths and loads. $L_A=5\mathrm{.}7ft.,L_B=3\mathrm{.}4ft.,w=2\mathrm{.}9$kip$\frac{s}{f}t$ and $P=20\mathrm{.}8$ kips. The answer should be in ksi with $1$ digit of accuracy.