Finding the Fourth Proportional to 11,503.24, 15,879.12 and 7,728.62

Step by Step Solution

1. Step 1: Write the proportion equation
   11,503.24 : 15,879.12 = 7,728.62 : x
2. Step 2: Convert to fraction form
   11,503.24/15,879.12 = 7,728.62/x
3. Step 3: Cross multiply
   11,503.24x = 15,879.12 × 7,728.62
4. Step 4: Simplify right side
   11,503.24x = 122,723,684.41
5. Step 5: Solve for x
   x = 122,723,684.41/11,503.24
6. Step 6: Final answer
   x = 10,668.62