Finding the Fourth Proportional to 11,728.69, 17,470.88 and 11,105.40

Step by Step Solution

1. Step 1: Write the proportion equation
   11,728.69 : 17,470.88 = 11,105.40 : x
2. Step 2: Convert to fraction form
   11,728.69/17,470.88 = 11,105.40/x
3. Step 3: Cross multiply
   11,728.69x = 17,470.88 × 11,105.40
4. Step 4: Simplify right side
   11,728.69x = 194,020,989.71
5. Step 5: Solve for x
   x = 194,020,989.71/11,728.69
6. Step 6: Final answer
   x = 16,542.42