Finding the Fourth Proportional to 21,648.39, 29,872.50 and 12,571.98

Step by Step Solution

1. Step 1: Write the proportion equation
   21,648.39 : 29,872.50 = 12,571.98 : x
2. Step 2: Convert to fraction form
   21,648.39/29,872.50 = 12,571.98/x
3. Step 3: Cross multiply
   21,648.39x = 29,872.50 × 12,571.98
4. Step 4: Simplify right side
   21,648.39x = 375,556,425.41
5. Step 5: Solve for x
   x = 375,556,425.41/21,648.39
6. Step 6: Final answer
   x = 17,348.01