Finding the Fourth Proportional to 21,517.59, 29,697.06 and 12,086.16

Step by Step Solution

1. Step 1: Write the proportion equation
   21,517.59 : 29,697.06 = 12,086.16 : x
2. Step 2: Convert to fraction form
   21,517.59/29,697.06 = 12,086.16/x
3. Step 3: Cross multiply
   21,517.59x = 29,697.06 × 12,086.16
4. Step 4: Simplify right side
   21,517.59x = 358,923,352.65
5. Step 5: Solve for x
   x = 358,923,352.65/21,517.59
6. Step 6: Final answer
   x = 16,680.46