Finding the Third Proportional to 639,426 and 1,400,676

Step by Step Solution

1. Step 1: Write the proportion equation
   639,426 : 1,400,676 = 1,400,676 : x
2. Step 2: Convert to fraction form
   639,426/1,400,676 = 1,400,676/x
3. Step 3: Cross multiply
   639,426x = 1,400,676 × 1,400,676
4. Step 4: Simplify right side
   639,426x = 1,961,893,256,976
5. Step 5: Solve for x
   x = 1,961,893,256,976/639,426
6. Step 6: Final answer
   x = 3,068,210.01