Finding the Third Proportional to 638,496 and 1,396,656

Step by Step Solution

1. Step 1: Write the proportion equation
   638,496 : 1,396,656 = 1,396,656 : x
2. Step 2: Convert to fraction form
   638,496/1,396,656 = 1,396,656/x
3. Step 3: Cross multiply
   638,496x = 1,396,656 × 1,396,656
4. Step 4: Simplify right side
   638,496x = 1,950,647,982,336
5. Step 5: Solve for x
   x = 1,950,647,982,336/638,496
6. Step 6: Final answer
   x = 3,055,066.88