Finding the Fourth Proportional to 21,086.28, 29,097.54 and 11,655

Step by Step Solution

1. Step 1: Write the proportion equation
   21,086.28 : 29,097.54 = 11,655 : x
2. Step 2: Convert to fraction form
   21,086.28/29,097.54 = 11,655/x
3. Step 3: Cross multiply
   21,086.28x = 29,097.54 × 11,655
4. Step 4: Simplify right side
   21,086.28x = 339,131,828.70
5. Step 5: Solve for x
   x = 339,131,828.70/21,086.28
6. Step 6: Final answer
   x = 16,083.06