Finding the Fourth Proportional to 11,160.57, 15,411.96 and 7,188.51

Step by Step Solution

1. Step 1: Write the proportion equation
   11,160.57 : 15,411.96 = 7,188.51 : x
2. Step 2: Convert to fraction form
   11,160.57/15,411.96 = 7,188.51/x
3. Step 3: Cross multiply
   11,160.57x = 15,411.96 × 7,188.51
4. Step 4: Simplify right side
   11,160.57x = 110,789,028.58
5. Step 5: Solve for x
   x = 110,789,028.58/11,160.57
6. Step 6: Final answer
   x = 9,926.83