Finding the Third Proportional to 423,357 and 648,522

Step by Step Solution

1. Step 1: Write the proportion equation
   423,357 : 648,522 = 648,522 : x
2. Step 2: Convert to fraction form
   423,357/648,522 = 648,522/x
3. Step 3: Cross multiply
   423,357x = 648,522 × 648,522
4. Step 4: Simplify right side
   423,357x = 420,580,784,484
5. Step 5: Solve for x
   x = 420,580,784,484/423,357
6. Step 6: Final answer
   x = 993,442.38