# Distance between two protons

The question is how far apart must two protons be for the magnitude of the electrostatic force acting on either one of them to be equal to the force acting on a proton at earths surface due to gravity?

I calculated the force acting on a proton at the earth's surface, very small of course, but in order to find the distance between the two protons shouldn't I know the charge of the protons inorder to have one unknown left, the distance?