Specify Where Its Line Of Action Intersects Member Ab Measured

Replace the loading on the frame by a single resultant force. Specify where its line of action intersects member AB, measured from A.
Given:
F1 = 300 lb M = 600 lb⋅ ft
F2 = 200 lb a = 3 ft
b = 4 ft
F3 = 400 lb
c = 2 ft
F4 = 200 lb d = 7 ft

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