Finding the Third Proportional to 639,981 and 1,382,589

Step by Step Solution

1. Step 1: Write the proportion equation
   639,981 : 1,382,589 = 1,382,589 : x
2. Step 2: Convert to fraction form
   639,981/1,382,589 = 1,382,589/x
3. Step 3: Cross multiply
   639,981x = 1,382,589 × 1,382,589
4. Step 4: Simplify right side
   639,981x = 1,911,552,342,921
5. Step 5: Solve for x
   x = 1,911,552,342,921/639,981
6. Step 6: Final answer
   x = 2,986,889.21