How to find attack point of resultant from a pressure field?

Hi,

I have some data which represents unevenly spread pressure along a wall

    % X            % Y
P =[   0              0
     9.34        1378.43
     9.34         610.86
    10.84        624.51
    10.84        751.48
    15.00       1032.41
    15.00         32.13
    15.54         33.27
    15.54             0
    16.84             0
    16.84             0
    18.34             0
    18.34         38.49
    19.00         40.01];

Now what I need to do is find the resultant and it's attack point on the wall

The resultant I can simply find by using the trapz function: F=trapz(P(:,1),P(:,2)) which for the above data example yields F=11117.85

However is there a way in matlab calculate the attack point (location of the resultant) in a easy way?

From manual calculation I find it to be 8.86 from zero.