Finding the Third Proportional to 438,453 and 642,127.50

Step by Step Solution

1. Step 1: Write the proportion equation
   438,453 : 642,127.50 = 642,127.50 : x
2. Step 2: Convert to fraction form
   438,453/642,127.50 = 642,127.50/x
3. Step 3: Cross multiply
   438,453x = 642,127.50 × 642,127.50
4. Step 4: Simplify right side
   438,453x = 412,327,726,256.25
5. Step 5: Solve for x
   x = 412,327,726,256.25/438,453
6. Step 6: Final answer
   x = 940,414.88