The safe load. L. of a wooden beam supported at both ends varies jointly as the width, w, the square of the depth, d, and inversely as the length, I. A wooden beam 8 in. wide, 4 in deep, and 17 ft long holds up 6407 lb. What load would a beam 5 in. wide, 5 in. deep and 19 ft long of the same material support? (Round off your
answer to the nearest pound.)