Finding the Fourth Proportional to 21,076.91, 29,085.79 and 11,516.59

Step by Step Solution

1. Step 1: Write the proportion equation
   21,076.91 : 29,085.79 = 11,516.59 : x
2. Step 2: Convert to fraction form
   21,076.91/29,085.79 = 11,516.59/x
3. Step 3: Cross multiply
   21,076.91x = 29,085.79 × 11,516.59
4. Step 4: Simplify right side
   21,076.91x = 334,969,016.75
5. Step 5: Solve for x
   x = 334,969,016.75/21,076.91
6. Step 6: Final answer
   x = 15,892.70