Finding the Fourth Proportional to 11,151.94, 15,369.66 and 9,156.10

Step by Step Solution

1. Step 1: Write the proportion equation
   11,151.94 : 15,369.66 = 9,156.10 : x
2. Step 2: Convert to fraction form
   11,151.94/15,369.66 = 9,156.10/x
3. Step 3: Cross multiply
   11,151.94x = 15,369.66 × 9,156.10
4. Step 4: Simplify right side
   11,151.94x = 140,726,143.93
5. Step 5: Solve for x
   x = 140,726,143.93/11,151.94
6. Step 6: Final answer
   x = 12,618.98