Finding the Fourth Proportional to 21,757.24, 30,029.82 and 12,331

Step by Step Solution

1. Step 1: Write the proportion equation
   21,757.24 : 30,029.82 = 12,331 : x
2. Step 2: Convert to fraction form
   21,757.24/30,029.82 = 12,331/x
3. Step 3: Cross multiply
   21,757.24x = 30,029.82 × 12,331
4. Step 4: Simplify right side
   21,757.24x = 370,297,710.42
5. Step 5: Solve for x
   x = 370,297,710.42/21,757.24
6. Step 6: Final answer
   x = 17,019.52