Finding the Third Proportional to 309,866 and 656,938

Step by Step Solution

1. Step 1: Write the proportion equation
   309,866 : 656,938 = 656,938 : x
2. Step 2: Convert to fraction form
   309,866/656,938 = 656,938/x
3. Step 3: Cross multiply
   309,866x = 656,938 × 656,938
4. Step 4: Simplify right side
   309,866x = 431,567,535,844
5. Step 5: Solve for x
   x = 431,567,535,844/309,866
6. Step 6: Final answer
   x = 1,392,755.37