Finding the Third Proportional to 309,657 and 656,524.50

Step by Step Solution

1. Step 1: Write the proportion equation
   309,657 : 656,524.50 = 656,524.50 : x
2. Step 2: Convert to fraction form
   309,657/656,524.50 = 656,524.50/x
3. Step 3: Cross multiply
   309,657x = 656,524.50 × 656,524.50
4. Step 4: Simplify right side
   309,657x = 431,024,419,100.25
5. Step 5: Solve for x
   x = 431,024,419,100.25/309,657
6. Step 6: Final answer
   x = 1,391,941.47