Finding the Third Proportional to 639,007 and 1,367,779

Step by Step Solution

1. Step 1: Write the proportion equation
   639,007 : 1,367,779 = 1,367,779 : x
2. Step 2: Convert to fraction form
   639,007/1,367,779 = 1,367,779/x
3. Step 3: Cross multiply
   639,007x = 1,367,779 × 1,367,779
4. Step 4: Simplify right side
   639,007x = 1,870,819,392,841
5. Step 5: Solve for x
   x = 1,870,819,392,841/639,007
6. Step 6: Final answer
   x = 2,927,697.81