Finding the Fourth Proportional to 21,540.88, 29,726.28 and 12,109.52

Step by Step Solution

1. Step 1: Write the proportion equation
   21,540.88 : 29,726.28 = 12,109.52 : x
2. Step 2: Convert to fraction form
   21,540.88/29,726.28 = 12,109.52/x
3. Step 3: Cross multiply
   21,540.88x = 29,726.28 × 12,109.52
4. Step 4: Simplify right side
   21,540.88x = 359,970,982.19
5. Step 5: Solve for x
   x = 359,970,982.19/21,540.88
6. Step 6: Final answer
   x = 16,711.06