Finding the Third Proportional to 31,711.50 and 69,072.75

Step by Step Solution

1. Step 1: Write the proportion equation
   31,711.50 : 69,072.75 = 69,072.75 : x
2. Step 2: Convert to fraction form
   31,711.50/69,072.75 = 69,072.75/x
3. Step 3: Cross multiply
   31,711.50x = 69,072.75 × 69,072.75
4. Step 4: Simplify right side
   31,711.50x = 4,771,044,792.56
5. Step 5: Solve for x
   x = 4,771,044,792.56/31,711.50
6. Step 6: Final answer
   x = 150,451.56