Finding the Fourth Proportional to 2,339.16, 3,506.06 and 857.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,339.16 : 3,506.06 = 857.72 : x
2. Step 2: Convert to fraction form
   2,339.16/3,506.06 = 857.72/x
3. Step 3: Cross multiply
   2,339.16x = 3,506.06 × 857.72
4. Step 4: Simplify right side
   2,339.16x = 3,007,217.78
5. Step 5: Solve for x
   x = 3,007,217.78/2,339.16
6. Step 6: Final answer
   x = 1,285.60