Finding the Third Proportional to 309,862.50 and 656,931

Step by Step Solution

1. Step 1: Write the proportion equation
   309,862.50 : 656,931 = 656,931 : x
2. Step 2: Convert to fraction form
   309,862.50/656,931 = 656,931/x
3. Step 3: Cross multiply
   309,862.50x = 656,931 × 656,931
4. Step 4: Simplify right side
   309,862.50x = 431,558,338,761
5. Step 5: Solve for x
   x = 431,558,338,761/309,862.50
6. Step 6: Final answer
   x = 1,392,741.42