Finding the Fourth Proportional to 2,589.46, 3,882.93 and 857.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,589.46 : 3,882.93 = 857.50 : x
2. Step 2: Convert to fraction form
   2,589.46/3,882.93 = 857.50/x
3. Step 3: Cross multiply
   2,589.46x = 3,882.93 × 857.50
4. Step 4: Simplify right side
   2,589.46x = 3,329,612.48
5. Step 5: Solve for x
   x = 3,329,612.48/2,589.46
6. Step 6: Final answer
   x = 1,285.83