Finding the Third Proportional to 309,787.50 and 656,734.50

Step by Step Solution

1. Step 1: Write the proportion equation
   309,787.50 : 656,734.50 = 656,734.50 : x
2. Step 2: Convert to fraction form
   309,787.50/656,734.50 = 656,734.50/x
3. Step 3: Cross multiply
   309,787.50x = 656,734.50 × 656,734.50
4. Step 4: Simplify right side
   309,787.50x = 431,300,203,490.25
5. Step 5: Solve for x
   x = 431,300,203,490.25/309,787.50
6. Step 6: Final answer
   x = 1,392,245.34