Finding the Fourth Proportional to 11,155.82, 15,382.59 and 7,171.43

Step by Step Solution

1. Step 1: Write the proportion equation
   11,155.82 : 15,382.59 = 7,171.43 : x
2. Step 2: Convert to fraction form
   11,155.82/15,382.59 = 7,171.43/x
3. Step 3: Cross multiply
   11,155.82x = 15,382.59 × 7,171.43
4. Step 4: Simplify right side
   11,155.82x = 110,315,167.40
5. Step 5: Solve for x
   x = 110,315,167.40/11,155.82
6. Step 6: Final answer
   x = 9,888.58