Finding the Fourth Proportional to 21,103.47, 29,123.55 and 11,672.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,103.47 : 29,123.55 = 11,672.10 : x
2. Step 2: Convert to fraction form
   21,103.47/29,123.55 = 11,672.10/x
3. Step 3: Cross multiply
   21,103.47x = 29,123.55 × 11,672.10
4. Step 4: Simplify right side
   21,103.47x = 339,932,987.96
5. Step 5: Solve for x
   x = 339,932,987.96/21,103.47
6. Step 6: Final answer
   x = 16,107.92