Finding the Third Proportional to 409,287 and 631,426.50

Step by Step Solution

1. Step 1: Write the proportion equation
   409,287 : 631,426.50 = 631,426.50 : x
2. Step 2: Convert to fraction form
   409,287/631,426.50 = 631,426.50/x
3. Step 3: Cross multiply
   409,287x = 631,426.50 × 631,426.50
4. Step 4: Simplify right side
   409,287x = 398,699,424,902.25
5. Step 5: Solve for x
   x = 398,699,424,902.25/409,287
6. Step 6: Final answer
   x = 974,131.66