The proton is a positively charged massive particle.Therefore it has both gravitational field and electromagnetic field. So, in this work special attention is given toEinstein’s gravitational field equations and Maxwell’s electromagnetic field equations.The four dimensionalmetric tensoris used here to solve this problem. The four-dimensional line elementis developed in such a way that the metric is solved in two separate ways. The solutionsfor two fieldsgive some suitable results. Later the formula is extended for the large massive body and gives an interesting resultthat life cannot survive in a planet of mass just greater than1.21 timemass of Jupiter planet.