Extracted text: From the given truss below, members are made of A36 (Fy=36ksi and Fu=58Ksi) steel channel section with A=1.56in2, rx=0.85in, ry=0.53in and X=Y=9ft. All applied loads are already factored: F1=39kips, F2=44kips, and F3=48kips. Calculate the vertical ultimate load "Pu" that can be applied at joint I in kips based on the design strength of member GD. Note: A negative (-Pu) may be a possible answer, if such affix the negative sign (-) before your answer. Express your answer in 2 decimal places. Pu F1 Y G F2 Y F3 E Y A Ex