Finding the Fourth Proportional to 21,542.36, 29,725.20 and 12,109.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,542.36 : 29,725.20 = 12,109.10 : x
2. Step 2: Convert to fraction form
   21,542.36/29,725.20 = 12,109.10/x
3. Step 3: Cross multiply
   21,542.36x = 29,725.20 × 12,109.10
4. Step 4: Simplify right side
   21,542.36x = 359,945,270.69
5. Step 5: Solve for x
   x = 359,945,270.69/21,542.36
6. Step 6: Final answer
   x = 16,708.72