Finding the Fourth Proportional to 21,540.80, 29,726.16 and 12,109.37

Step by Step Solution

1. Step 1: Write the proportion equation
   21,540.80 : 29,726.16 = 12,109.37 : x
2. Step 2: Convert to fraction form
   21,540.80/29,726.16 = 12,109.37/x
3. Step 3: Cross multiply
   21,540.80x = 29,726.16 × 12,109.37
4. Step 4: Simplify right side
   21,540.80x = 359,965,070.12
5. Step 5: Solve for x
   x = 359,965,070.12/21,540.80
6. Step 6: Final answer
   x = 16,710.85