Finding the Third Proportional to 642,408 and 1,383,480

Step by Step Solution

1. Step 1: Write the proportion equation
   642,408 : 1,383,480 = 1,383,480 : x
2. Step 2: Convert to fraction form
   642,408/1,383,480 = 1,383,480/x
3. Step 3: Cross multiply
   642,408x = 1,383,480 × 1,383,480
4. Step 4: Simplify right side
   642,408x = 1,914,016,910,400
5. Step 5: Solve for x
   x = 1,914,016,910,400/642,408
6. Step 6: Final answer
   x = 2,979,441.27