Finding the Fourth Proportional to 21,552.42, 29,743.47 and 12,121.59

Step by Step Solution

1. Step 1: Write the proportion equation
   21,552.42 : 29,743.47 = 12,121.59 : x
2. Step 2: Convert to fraction form
   21,552.42/29,743.47 = 12,121.59/x
3. Step 3: Cross multiply
   21,552.42x = 29,743.47 × 12,121.59
4. Step 4: Simplify right side
   21,552.42x = 360,538,148.52
5. Step 5: Solve for x
   x = 360,538,148.52/21,552.42
6. Step 6: Final answer
   x = 16,728.43