Finding the Third Proportional to 309,850.50 and 656,896.50

Step by Step Solution

1. Step 1: Write the proportion equation
   309,850.50 : 656,896.50 = 656,896.50 : x
2. Step 2: Convert to fraction form
   309,850.50/656,896.50 = 656,896.50/x
3. Step 3: Cross multiply
   309,850.50x = 656,896.50 × 656,896.50
4. Step 4: Simplify right side
   309,850.50x = 431,513,011,712.25
5. Step 5: Solve for x
   x = 431,513,011,712.25/309,850.50
6. Step 6: Final answer
   x = 1,392,649.07