Finding the Fourth Proportional to 21,789.55, 30,067.09 and 12,227.45

Step by Step Solution

1. Step 1: Write the proportion equation
   21,789.55 : 30,067.09 = 12,227.45 : x
2. Step 2: Convert to fraction form
   21,789.55/30,067.09 = 12,227.45/x
3. Step 3: Cross multiply
   21,789.55x = 30,067.09 × 12,227.45
4. Step 4: Simplify right side
   21,789.55x = 367,643,778.48
5. Step 5: Solve for x
   x = 367,643,778.48/21,789.55
6. Step 6: Final answer
   x = 16,872.49