Finding the Third Proportional to 18,400.50 and 39,715.31

Step by Step Solution

1. Step 1: Write the proportion equation
   18,400.50 : 39,715.31 = 39,715.31 : x
2. Step 2: Convert to fraction form
   18,400.50/39,715.31 = 39,715.31/x
3. Step 3: Cross multiply
   18,400.50x = 39,715.31 × 39,715.31
4. Step 4: Simplify right side
   18,400.50x = 1,577,306,046.97
5. Step 5: Solve for x
   x = 1,577,306,046.97/18,400.50
6. Step 6: Final answer
   x = 85,720.83