If P2=296, then ln(P2/760)=ln(296/760)=ln(37/95)=-0.943 approx.
If you mean ln(P2/760)=(40700/8.314)(1/373-1/x), then:
-0.943=4895.357(0.002681-1/x),
0.002681-1/x=-0.0001926,
1/x=0.002681+0.0001926=0.002874, x=1/0.002874=348.
There are other approaches to the solution, but all will produce x=348 (correct to 3 sig figures).