(Solved): I am aware we have to use double interpolation for the last part, but i am unsure how to go ahout ...

I am aware we have to use double interpolation for the last part, but i am unsure how to go ahout that. Can you help me? Problem 3.94E Saturated water vapor at

is heated at constant pressure until its volume has doubled. Determine the final temperature using the ideal gas equation of state, the compressibility charts, and the steam tables.