Finding the Fourth Proportional to 21,517.52, 29,697.24 and 12,086.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,517.52 : 29,697.24 = 12,086.72 : x
2. Step 2: Convert to fraction form
   21,517.52/29,697.24 = 12,086.72/x
3. Step 3: Cross multiply
   21,517.52x = 29,697.24 × 12,086.72
4. Step 4: Simplify right side
   21,517.52x = 358,942,224.65
5. Step 5: Solve for x
   x = 358,942,224.65/21,517.52
6. Step 6: Final answer
   x = 16,681.39