Finding the Fourth Proportional to 21,149.11, 29,185.71 and 12,196.60

Step by Step Solution

1. Step 1: Write the proportion equation
   21,149.11 : 29,185.71 = 12,196.60 : x
2. Step 2: Convert to fraction form
   21,149.11/29,185.71 = 12,196.60/x
3. Step 3: Cross multiply
   21,149.11x = 29,185.71 × 12,196.60
4. Step 4: Simplify right side
   21,149.11x = 355,966,430.59
5. Step 5: Solve for x
   x = 355,966,430.59/21,149.11
6. Step 6: Final answer
   x = 16,831.27