Finding the Third Proportional to 642,386 and 1,383,436

Step by Step Solution

1. Step 1: Write the proportion equation
   642,386 : 1,383,436 = 1,383,436 : x
2. Step 2: Convert to fraction form
   642,386/1,383,436 = 1,383,436/x
3. Step 3: Cross multiply
   642,386x = 1,383,436 × 1,383,436
4. Step 4: Simplify right side
   642,386x = 1,913,895,166,096
5. Step 5: Solve for x
   x = 1,913,895,166,096/642,386
6. Step 6: Final answer
   x = 2,979,353.79