Finding the Third Proportional to 152,716.50 and 315,909

Step by Step Solution

1. Step 1: Write the proportion equation
   152,716.50 : 315,909 = 315,909 : x
2. Step 2: Convert to fraction form
   152,716.50/315,909 = 315,909/x
3. Step 3: Cross multiply
   152,716.50x = 315,909 × 315,909
4. Step 4: Simplify right side
   152,716.50x = 99,798,496,281
5. Step 5: Solve for x
   x = 99,798,496,281/152,716.50
6. Step 6: Final answer
   x = 653,488.63