Finding the Third Proportional to 639,416 and 1,400,656

Step by Step Solution

1. Step 1: Write the proportion equation
   639,416 : 1,400,656 = 1,400,656 : x
2. Step 2: Convert to fraction form
   639,416/1,400,656 = 1,400,656/x
3. Step 3: Cross multiply
   639,416x = 1,400,656 × 1,400,656
4. Step 4: Simplify right side
   639,416x = 1,961,837,230,336
5. Step 5: Solve for x
   x = 1,961,837,230,336/639,416
6. Step 6: Final answer
   x = 3,068,170.38