Finding the Fourth Proportional to 21,517.97, 29,697.59 and 12,086.54

Step by Step Solution

1. Step 1: Write the proportion equation
   21,517.97 : 29,697.59 = 12,086.54 : x
2. Step 2: Convert to fraction form
   21,517.97/29,697.59 = 12,086.54/x
3. Step 3: Cross multiply
   21,517.97x = 29,697.59 × 12,086.54
4. Step 4: Simplify right side
   21,517.97x = 358,940,900.52
5. Step 5: Solve for x
   x = 358,940,900.52/21,517.97
6. Step 6: Final answer
   x = 16,680.99