Finding the Fourth Proportional to 21,540.16, 29,725.24 and 12,108.76

Step by Step Solution

1. Step 1: Write the proportion equation
   21,540.16 : 29,725.24 = 12,108.76 : x
2. Step 2: Convert to fraction form
   21,540.16/29,725.24 = 12,108.76/x
3. Step 3: Cross multiply
   21,540.16x = 29,725.24 × 12,108.76
4. Step 4: Simplify right side
   21,540.16x = 359,935,797.10
5. Step 5: Solve for x
   x = 359,935,797.10/21,540.16
6. Step 6: Final answer
   x = 16,709.99