Finding the Fourth Proportional to 11,103.30, 15,329.39 and 7,131.42

Step by Step Solution

1. Step 1: Write the proportion equation
   11,103.30 : 15,329.39 = 7,131.42 : x
2. Step 2: Convert to fraction form
   11,103.30/15,329.39 = 7,131.42/x
3. Step 3: Cross multiply
   11,103.30x = 15,329.39 × 7,131.42
4. Step 4: Simplify right side
   11,103.30x = 109,320,318.43
5. Step 5: Solve for x
   x = 109,320,318.43/11,103.30
6. Step 6: Final answer
   x = 9,845.75