Finding the Third Proportional to 639,598 and 1,391,949

Step by Step Solution

1. Step 1: Write the proportion equation
   639,598 : 1,391,949 = 1,391,949 : x
2. Step 2: Convert to fraction form
   639,598/1,391,949 = 1,391,949/x
3. Step 3: Cross multiply
   639,598x = 1,391,949 × 1,391,949
4. Step 4: Simplify right side
   639,598x = 1,937,522,018,601
5. Step 5: Solve for x
   x = 1,937,522,018,601/639,598
6. Step 6: Final answer
   x = 3,029,280.92