Finding the Fourth Proportional to 11,105.80, 15,329.22 and 7,331.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,105.80 : 15,329.22 = 7,331.72 : x
2. Step 2: Convert to fraction form
   11,105.80/15,329.22 = 7,331.72/x
3. Step 3: Cross multiply
   11,105.80x = 15,329.22 × 7,331.72
4. Step 4: Simplify right side
   11,105.80x = 112,389,548.86
5. Step 5: Solve for x
   x = 112,389,548.86/11,105.80
6. Step 6: Final answer
   x = 10,119.90