Finding the Fourth Proportional to 2,158.57, 3,238.43 and 1,171.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.57 : 3,238.43 = 1,171.15 : x
2. Step 2: Convert to fraction form
   2,158.57/3,238.43 = 1,171.15/x
3. Step 3: Cross multiply
   2,158.57x = 3,238.43 × 1,171.15
4. Step 4: Simplify right side
   2,158.57x = 3,792,687.29
5. Step 5: Solve for x
   x = 3,792,687.29/2,158.57
6. Step 6: Final answer
   x = 1,757.04