$${\frac{dm}{dt} = \frac{\Delta m}{\Delta E} P = \frac{4 (1,67 \times 10^{-27}\, \mathrm{kg})}{4,20 \times 10^{11}\, \mathrm{J}} (3,90 \times 10^{26}\, \mathrm{W}) \\ = \underline{\underline{6,2 \times 10^{11}\, \mathrm{kg/s}}}}$$