Finding the Fourth Proportional to 21,081.72, 29,092.82 and 11,521.76

Step by Step Solution

1. Step 1: Write the proportion equation
   21,081.72 : 29,092.82 = 11,521.76 : x
2. Step 2: Convert to fraction form
   21,081.72/29,092.82 = 11,521.76/x
3. Step 3: Cross multiply
   21,081.72x = 29,092.82 × 11,521.76
4. Step 4: Simplify right side
   21,081.72x = 335,200,489.76
5. Step 5: Solve for x
   x = 335,200,489.76/21,081.72
6. Step 6: Final answer
   x = 15,900.05