The density of water at 21 degrees C is 0.997992 g/mL. The density of water at 22 degrees C is 0.997770 g/mL. What is the density of water if the room temperature is 21.3 degrees C??

So I would just multiply 30 percent of the density at 21 degrees C but I'm stuck on how to find the density specifically at 21.3 degrees C?