Please show work

The portable jack stand carries a downward load of $600$ lbs$.$ How much compressive force is there in

each of the four symmetrical legs OA$,$ OB$,$ OC$,$ and OD$?$ Assume that all connections are ball joints and

that the only reactions from the ground are equal vertical forces $($using symmetry$)$ at A$,$ B$,$ C$,$ and D$.$

Also, neglect the dimensions of the top plate. Use Method of Joints for this problem.