Finding the Third Proportional to 863,685 and 1,858,590

Step by Step Solution

1. Step 1: Write the proportion equation
   863,685 : 1,858,590 = 1,858,590 : x
2. Step 2: Convert to fraction form
   863,685/1,858,590 = 1,858,590/x
3. Step 3: Cross multiply
   863,685x = 1,858,590 × 1,858,590
4. Step 4: Simplify right side
   863,685x = 3,454,356,788,100
5. Step 5: Solve for x
   x = 3,454,356,788,100/863,685
6. Step 6: Final answer
   x = 3,999,556.31