Since you have 2 independent variables, the scenario that you describe seems to be a curve-fitting problem. Based on the knowledge of what 'X' & 'Y' represent, you may have to estimate the relationship between the output data (F(x,y)) and the 2 input independent variables (X & Y). Once you get the relationship, you could then use that to evaluate F(x,0.03). Note that in theory, there could be multiple curves that could pass through the given set of points.
These following links may have the information needed to establish the relationship:
Hope this helps!