Finding the Third Proportional to 642,404 and 1,383,472

Step by Step Solution

1. Step 1: Write the proportion equation
   642,404 : 1,383,472 = 1,383,472 : x
2. Step 2: Convert to fraction form
   642,404/1,383,472 = 1,383,472/x
3. Step 3: Cross multiply
   642,404x = 1,383,472 × 1,383,472
4. Step 4: Simplify right side
   642,404x = 1,913,994,774,784
5. Step 5: Solve for x
   x = 1,913,994,774,784/642,404
6. Step 6: Final answer
   x = 2,979,425.37