Truss structures will typically have joints where two$-$force members connect to an abutment. In the illustration below, four tensile members connect to a gusset plate attached to an abutment. If the magnitude of the forces exerted by the cables are $|$T$1|=2,800$ lbf$,|$T$2|=3,200$ lbf$,|$T$3|=4,000$ lbf$,$ and $|$T$4|=5,000$ lbf; then what is the magnitude of the total force exerted by the four cables onto the abutment?