Finding the Third Proportional to 638,500 and 1,396,664

Step by Step Solution

1. Step 1: Write the proportion equation
   638,500 : 1,396,664 = 1,396,664 : x
2. Step 2: Convert to fraction form
   638,500/1,396,664 = 1,396,664/x
3. Step 3: Cross multiply
   638,500x = 1,396,664 × 1,396,664
4. Step 4: Simplify right side
   638,500x = 1,950,670,328,896
5. Step 5: Solve for x
   x = 1,950,670,328,896/638,500
6. Step 6: Final answer
   x = 3,055,082.74