Hello there,
I hold a university PhD degree in electrical power systems and teach my students Power Systems Analysis.
My lectures include power flow calculation using Gauss-Seidel, Newton-Raphson, fast decoupled and DC computation method.
Therefore, I am able to solve your problem by using Gauss-Seidel or Newton Raphson method either manually or by using PowerWorld Simulator.
If you choose the GS method, calculation will need significantly more iterations to converge (several tens or even one hundred iterations).
NR method will converge in just couple of iterations with results having the precision of 0.001 or better.
Best regards,
Clockwell