Finding the Third Proportional to 404,388 and 623,448

Step by Step Solution

1. Step 1: Write the proportion equation
   404,388 : 623,448 = 623,448 : x
2. Step 2: Convert to fraction form
   404,388/623,448 = 623,448/x
3. Step 3: Cross multiply
   404,388x = 623,448 × 623,448
4. Step 4: Simplify right side
   404,388x = 388,687,408,704
5. Step 5: Solve for x
   x = 388,687,408,704/404,388
6. Step 6: Final answer
   x = 961,174.44