Hi there, i have a problem that needs solving. Put simply it goes like this:

I have lots of objects all referenced from there own centres of gravity to a point in 3D space and i need to know the common centre of gravity of all these objects combined.

I dont know if i am just not seeing the easy solution to this or whether it is genuinely a complicated problem...

Any ideas on an explanation or a formula, that Excel could handle to do this, would be awesome.

All the points have an X,Y,Z position on Right hand coordinate system.

Cheers, Nad.