$4,1$ point

Find the mass$-$radius necessary to balance the moments for the following $2$ masses in $3$ dimensions. You are to balance the moments about plane $B$ by finding the mass

add to plane A $.$ The first mr is $253$ lb $-$in at an angle of $89$ and distance of $-4\mathrm{.}5$ inches from plane B $.$ The second mr is $467$ lb $-$in at an angle of $197$ and distance of $-1\mathrm{.}8$ inches from

plane B $.$ The moments are to be balanced by putting mass on plane A which is $5$ inches from plane B $.($Enter your answer to the nearest positive whole number of $Ib*in.)$