Finding the Fourth Proportional to 11,160.18, 15,411.42 and 7,188.18

Step by Step Solution

1. Step 1: Write the proportion equation
   11,160.18 : 15,411.42 = 7,188.18 : x
2. Step 2: Convert to fraction form
   11,160.18/15,411.42 = 7,188.18/x
3. Step 3: Cross multiply
   11,160.18x = 15,411.42 × 7,188.18
4. Step 4: Simplify right side
   11,160.18x = 110,780,061.02
5. Step 5: Solve for x
   x = 110,780,061.02/11,160.18
6. Step 6: Final answer
   x = 9,926.37