Finding the Third Proportional to 639,442 and 1,399,238

Step by Step Solution

1. Step 1: Write the proportion equation
   639,442 : 1,399,238 = 1,399,238 : x
2. Step 2: Convert to fraction form
   639,442/1,399,238 = 1,399,238/x
3. Step 3: Cross multiply
   639,442x = 1,399,238 × 1,399,238
4. Step 4: Simplify right side
   639,442x = 1,957,866,980,644
5. Step 5: Solve for x
   x = 1,957,866,980,644/639,442
6. Step 6: Final answer
   x = 3,061,836.70