At a fabrication plant, a hot metal forging has a mass of 90.8 kg, and a specific heat capacity of 434 J/(kg C°). To harden it, the forging is quenched by immersion in 689 kg of oil that has a temperature of 38.3°C and a specific heat capacity of 2680 J/(kg C°). The final temperature of the oil and forging at thermal equilibrium is 58.9°C. Assuming that heat flows only between the forging and the oil, determine the initial temperature in degrees Celsius of the forging.