Finding the Third Proportional to 399,112.50 and 631,866

Step by Step Solution

1. Step 1: Write the proportion equation
   399,112.50 : 631,866 = 631,866 : x
2. Step 2: Convert to fraction form
   399,112.50/631,866 = 631,866/x
3. Step 3: Cross multiply
   399,112.50x = 631,866 × 631,866
4. Step 4: Simplify right side
   399,112.50x = 399,254,641,956
5. Step 5: Solve for x
   x = 399,254,641,956/399,112.50
6. Step 6: Final answer
   x = 1,000,356.15