Finding the Fourth Proportional to 11,105.11, 15,323.57 and 7,131.61

Step by Step Solution

1. Step 1: Write the proportion equation
   11,105.11 : 15,323.57 = 7,131.61 : x
2. Step 2: Convert to fraction form
   11,105.11/15,323.57 = 7,131.61/x
3. Step 3: Cross multiply
   11,105.11x = 15,323.57 × 7,131.61
4. Step 4: Simplify right side
   11,105.11x = 109,281,717.94
5. Step 5: Solve for x
   x = 109,281,717.94/11,105.11
6. Step 6: Final answer
   x = 9,840.67