Finding the Fourth Proportional to 21,091.98, 29,105.85 and 11,658.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,091.98 : 29,105.85 = 11,658.72 : x
2. Step 2: Convert to fraction form
   21,091.98/29,105.85 = 11,658.72/x
3. Step 3: Cross multiply
   21,091.98x = 29,105.85 × 11,658.72
4. Step 4: Simplify right side
   21,091.98x = 339,336,955.51
5. Step 5: Solve for x
   x = 339,336,955.51/21,091.98
6. Step 6: Final answer
   x = 16,088.44