Finding the Third Proportional to 642,422 and 1,383,508

Step by Step Solution

1. Step 1: Write the proportion equation
   642,422 : 1,383,508 = 1,383,508 : x
2. Step 2: Convert to fraction form
   642,422/1,383,508 = 1,383,508/x
3. Step 3: Cross multiply
   642,422x = 1,383,508 × 1,383,508
4. Step 4: Simplify right side
   642,422x = 1,914,094,386,064
5. Step 5: Solve for x
   x = 1,914,094,386,064/642,422
6. Step 6: Final answer
   x = 2,979,496.94