Finding the Third Proportional to 142,057.50 and 315,645

Step by Step Solution

1. Step 1: Write the proportion equation
   142,057.50 : 315,645 = 315,645 : x
2. Step 2: Convert to fraction form
   142,057.50/315,645 = 315,645/x
3. Step 3: Cross multiply
   142,057.50x = 315,645 × 315,645
4. Step 4: Simplify right side
   142,057.50x = 99,631,766,025
5. Step 5: Solve for x
   x = 99,631,766,025/142,057.50
6. Step 6: Final answer
   x = 701,348.16