Finding the Fourth Proportional to 21,168.88, 29,212.72 and 11,737.60

Step by Step Solution

1. Step 1: Write the proportion equation
   21,168.88 : 29,212.72 = 11,737.60 : x
2. Step 2: Convert to fraction form
   21,168.88/29,212.72 = 11,737.60/x
3. Step 3: Cross multiply
   21,168.88x = 29,212.72 × 11,737.60
4. Step 4: Simplify right side
   21,168.88x = 342,887,222.27
5. Step 5: Solve for x
   x = 342,887,222.27/21,168.88
6. Step 6: Final answer
   x = 16,197.70