Finding the Fourth Proportional to 21,517.55, 29,697 and 12,086.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,517.55 : 29,697 = 12,086.12 : x
2. Step 2: Convert to fraction form
   21,517.55/29,697 = 12,086.12/x
3. Step 3: Cross multiply
   21,517.55x = 29,697 × 12,086.12
4. Step 4: Simplify right side
   21,517.55x = 358,921,357.16
5. Step 5: Solve for x
   x = 358,921,357.16/21,517.55
6. Step 6: Final answer
   x = 16,680.40