Finding the Fourth Proportional to 2,589.93, 3,885.17 and 858.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,589.93 : 3,885.17 = 858.69 : x
2. Step 2: Convert to fraction form
   2,589.93/3,885.17 = 858.69/x
3. Step 3: Cross multiply
   2,589.93x = 3,885.17 × 858.69
4. Step 4: Simplify right side
   2,589.93x = 3,336,152.33
5. Step 5: Solve for x
   x = 3,336,152.33/2,589.93
6. Step 6: Final answer
   x = 1,288.12