Sure! I'm not sure if you need the Full Development System or Advanced Analysis VIs, but the VI you are looking for is in Functions -> Mathematics -> Curve Fitting -> Polynomial Interpolation.VI. What this VI will do is take an array of X and Y values, and then an X value that you want to interpolate/extrapolate. The VI will interpolate if the X value is within the X values of the input, or extrapolate if it is not. It will return the Y value at that X value.
Since you want the Y, just switch the Y and X values.
Mark
