Finding the Third Proportional to 399,038 and 861,382

Step by Step Solution

1. Step 1: Write the proportion equation
   399,038 : 861,382 = 861,382 : x
2. Step 2: Convert to fraction form
   399,038/861,382 = 861,382/x
3. Step 3: Cross multiply
   399,038x = 861,382 × 861,382
4. Step 4: Simplify right side
   399,038x = 741,978,949,924
5. Step 5: Solve for x
   x = 741,978,949,924/399,038
6. Step 6: Final answer
   x = 1,859,419.28