Electric Fields and charged particles

Let's say there's a question where there are two charges placed, and a point in between and above the line connecting the two charges forms a triangle like this:

http://session.masteringphysics.com/problemAsset/1413940/2/p19.5.jpg

What would one have to do in order to find the electric field at point P? Would it be having to use the component method to find the x and y values, then using Pythagorean theorem and so on?

(I couldn't use the template for this post)

 

I tried using that to find the y values, added them up, yet its too large. The net x value in the actual question is 0 in the center of the two charges.

 

The height of the triangle is the square root of 3m. An electric field at this distance away from one of the points would have a magnitude of 17980N/C. Multiplying that by two because there are two charges gives a magnitude of 35960N/C upward. The correct answer is 1.2x10^5N/C.

 

I'm not sure what you mean here. Is the distance in the y-axis? The hypotenuse? Also, I check and the answer in the book isn't correct. So the answer that I got is not correct?

 

The electric field intensity at a point 2m away from one of the charges is 13485N/C which is the hypotenuse. I know the angle at the bottom two vertices are 60 degrees. Doing (13485N/C)sin60 gives an answer of 11678N/C. Multiplying that by two gives 23357N/C upward. Is this the correct process?

 

Thanks!! :D