Finding the Fourth Proportional to 11,229.78, 15,498.53 and 9,338.11

Step by Step Solution

1. Step 1: Write the proportion equation
   11,229.78 : 15,498.53 = 9,338.11 : x
2. Step 2: Convert to fraction form
   11,229.78/15,498.53 = 9,338.11/x
3. Step 3: Cross multiply
   11,229.78x = 15,498.53 × 9,338.11
4. Step 4: Simplify right side
   11,229.78x = 144,726,853.80
5. Step 5: Solve for x
   x = 144,726,853.80/11,229.78
6. Step 6: Final answer
   x = 12,887.77