Finding the Third Proportional to 405,651 and 631,399.50

Step by Step Solution

1. Step 1: Write the proportion equation
   405,651 : 631,399.50 = 631,399.50 : x
2. Step 2: Convert to fraction form
   405,651/631,399.50 = 631,399.50/x
3. Step 3: Cross multiply
   405,651x = 631,399.50 × 631,399.50
4. Step 4: Simplify right side
   405,651x = 398,665,328,600.25
5. Step 5: Solve for x
   x = 398,665,328,600.25/405,651
6. Step 6: Final answer
   x = 982,779.11