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Problem is: three positive point charges, q, are placed in an equal lateral triangle, charges being the vertex's. Length of one side is a. Calculate the electric feild at point P, which is also the the location of the topmost charge. Base of triangle is parrallel to page.

Hoping everyone understands that description, this is where I'm having problems.

eq: E = 2 * ((k * q)/(r^2)) * (unit vector, r)

My natural inclanation is to sum up the E's and treat it like a gravitation problem, however, I don't grasp the effect of having a charge ontop of point P will have on the electric field. Do I really just simply sum up the components of the fields from each charge?