Finding the Third Proportional to 309,878 and 656,957

Step by Step Solution

1. Step 1: Write the proportion equation
   309,878 : 656,957 = 656,957 : x
2. Step 2: Convert to fraction form
   309,878/656,957 = 656,957/x
3. Step 3: Cross multiply
   309,878x = 656,957 × 656,957
4. Step 4: Simplify right side
   309,878x = 431,592,499,849
5. Step 5: Solve for x
   x = 431,592,499,849/309,878
6. Step 6: Final answer
   x = 1,392,782.00