Finding the Fourth Proportional to 21,471.72, 29,630.76 and 12,040.20

Step by Step Solution

1. Step 1: Write the proportion equation
   21,471.72 : 29,630.76 = 12,040.20 : x
2. Step 2: Convert to fraction form
   21,471.72/29,630.76 = 12,040.20/x
3. Step 3: Cross multiply
   21,471.72x = 29,630.76 × 12,040.20
4. Step 4: Simplify right side
   21,471.72x = 356,760,276.55
5. Step 5: Solve for x
   x = 356,760,276.55/21,471.72
6. Step 6: Final answer
   x = 16,615.36