Finding the Fourth Proportional to 11,391.15, 17,079.42 and 4,815.57

Step by Step Solution

1. Step 1: Write the proportion equation
   11,391.15 : 17,079.42 = 4,815.57 : x
2. Step 2: Convert to fraction form
   11,391.15/17,079.42 = 4,815.57/x
3. Step 3: Cross multiply
   11,391.15x = 17,079.42 × 4,815.57
4. Step 4: Simplify right side
   11,391.15x = 82,247,142.57
5. Step 5: Solve for x
   x = 82,247,142.57/11,391.15
6. Step 6: Final answer
   x = 7,220.27