Finding the Third Proportional to 638,508 and 1,396,680

Step by Step Solution

1. Step 1: Write the proportion equation
   638,508 : 1,396,680 = 1,396,680 : x
2. Step 2: Convert to fraction form
   638,508/1,396,680 = 1,396,680/x
3. Step 3: Cross multiply
   638,508x = 1,396,680 × 1,396,680
4. Step 4: Simplify right side
   638,508x = 1,950,715,022,400
5. Step 5: Solve for x
   x = 1,950,715,022,400/638,508
6. Step 6: Final answer
   x = 3,055,114.46