A mechanically fastened joint subjected to tension has a total member stiffness of km = 378 * 10^6 lbf/in, bolt stiffness of kb = 3.69 * 10^6 lbf/in. If the joint is held together with a ½ in – 20 UNF x 1 ½ SAE 5 bolt and subjected to an external load of P = 5678.9 lbf, determine the required preload to maintain a factor of safety against joint separation of n0 = 3.