Finding the Third Proportional to 639,018 and 1,377,684

Step by Step Solution

1. Step 1: Write the proportion equation
   639,018 : 1,377,684 = 1,377,684 : x
2. Step 2: Convert to fraction form
   639,018/1,377,684 = 1,377,684/x
3. Step 3: Cross multiply
   639,018x = 1,377,684 × 1,377,684
4. Step 4: Simplify right side
   639,018x = 1,898,013,203,856
5. Step 5: Solve for x
   x = 1,898,013,203,856/639,018
6. Step 6: Final answer
   x = 2,970,203.04