Finding the Third Proportional to 399,792 and 858,870

Step by Step Solution

1. Step 1: Write the proportion equation
   399,792 : 858,870 = 858,870 : x
2. Step 2: Convert to fraction form
   399,792/858,870 = 858,870/x
3. Step 3: Cross multiply
   399,792x = 858,870 × 858,870
4. Step 4: Simplify right side
   399,792x = 737,657,676,900
5. Step 5: Solve for x
   x = 737,657,676,900/399,792
6. Step 6: Final answer
   x = 1,845,103.65