Finding the Third Proportional to 18,278.16 and 39,912.75

Step by Step Solution

1. Step 1: Write the proportion equation
   18,278.16 : 39,912.75 = 39,912.75 : x
2. Step 2: Convert to fraction form
   18,278.16/39,912.75 = 39,912.75/x
3. Step 3: Cross multiply
   18,278.16x = 39,912.75 × 39,912.75
4. Step 4: Simplify right side
   18,278.16x = 1,593,027,612.56
5. Step 5: Solve for x
   x = 1,593,027,612.56/18,278.16
6. Step 6: Final answer
   x = 87,154.72