Finding the Fourth Proportional to 2,359.86, 3,539.84 and 858.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,359.86 : 3,539.84 = 858.83 : x
2. Step 2: Convert to fraction form
   2,359.86/3,539.84 = 858.83/x
3. Step 3: Cross multiply
   2,359.86x = 3,539.84 × 858.83
4. Step 4: Simplify right side
   2,359.86x = 3,040,098.79
5. Step 5: Solve for x
   x = 3,040,098.79/2,359.86
6. Step 6: Final answer
   x = 1,288.26