Finding the Fourth Proportional to 2,339.43, 3,508.67 and 858.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,339.43 : 3,508.67 = 858.15 : x
2. Step 2: Convert to fraction form
   2,339.43/3,508.67 = 858.15/x
3. Step 3: Cross multiply
   2,339.43x = 3,508.67 × 858.15
4. Step 4: Simplify right side
   2,339.43x = 3,010,946.43
5. Step 5: Solve for x
   x = 3,010,946.43/2,339.43
6. Step 6: Final answer
   x = 1,287.04