How to calculate values from chart

Welcome to the Forum obeeey !

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This problem is not simple but it is straightforward. This requires a little algebra to interpolate the intersecting point, because the point where these curves intersect is not one of points given in the data. Given the nature of these curves and the short distance between the points I would recommend linear interpolation, although another method may be more precise.

It's also a bit tricky to even determine what is the highest intersection point (highest meaning highest y value). You have to compare each pair of two points to the next pair to determine if the lines intersect between those two pairs of points, then determine which one has the highest y value.

I do not have a ready-made solution but I could work on it with your file, as could many other folks here.