Finding the Fourth Proportional to 21,517.50, 29,695.67 and 12,086.07

Step by Step Solution

1. Step 1: Write the proportion equation
   21,517.50 : 29,695.67 = 12,086.07 : x
2. Step 2: Convert to fraction form
   21,517.50/29,695.67 = 12,086.07/x
3. Step 3: Cross multiply
   21,517.50x = 29,695.67 × 12,086.07
4. Step 4: Simplify right side
   21,517.50x = 358,903,885.89
5. Step 5: Solve for x
   x = 358,903,885.89/21,517.50
6. Step 6: Final answer
   x = 16,679.63