Finding the Fourth Proportional to 21,103.25, 29,123.40 and 11,671.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,103.25 : 29,123.40 = 11,671.82 : x
2. Step 2: Convert to fraction form
   21,103.25/29,123.40 = 11,671.82/x
3. Step 3: Cross multiply
   21,103.25x = 29,123.40 × 11,671.82
4. Step 4: Simplify right side
   21,103.25x = 339,923,082.59
5. Step 5: Solve for x
   x = 339,923,082.59/21,103.25
6. Step 6: Final answer
   x = 16,107.62