Finding the Fourth Proportional to 21,087.98, 29,103.15 and 11,658.38

Step by Step Solution

1. Step 1: Write the proportion equation
   21,087.98 : 29,103.15 = 11,658.38 : x
2. Step 2: Convert to fraction form
   21,087.98/29,103.15 = 11,658.38/x
3. Step 3: Cross multiply
   21,087.98x = 29,103.15 × 11,658.38
4. Step 4: Simplify right side
   21,087.98x = 339,295,581.90
5. Step 5: Solve for x
   x = 339,295,581.90/21,087.98
6. Step 6: Final answer
   x = 16,089.53