Finding the Fourth Proportional to 21,123.54, 29,150.46 and 12,171.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,123.54 : 29,150.46 = 12,171.42 : x
2. Step 2: Convert to fraction form
   21,123.54/29,150.46 = 12,171.42/x
3. Step 3: Cross multiply
   21,123.54x = 29,150.46 × 12,171.42
4. Step 4: Simplify right side
   21,123.54x = 354,802,491.85
5. Step 5: Solve for x
   x = 354,802,491.85/21,123.54
6. Step 6: Final answer
   x = 16,796.55