Finding the Fourth Proportional to 21,897, 30,217.86 and 13,520.52

Step by Step Solution

1. Step 1: Write the proportion equation
   21,897 : 30,217.86 = 13,520.52 : x
2. Step 2: Convert to fraction form
   21,897/30,217.86 = 13,520.52/x
3. Step 3: Cross multiply
   21,897x = 30,217.86 × 13,520.52
4. Step 4: Simplify right side
   21,897x = 408,561,180.49
5. Step 5: Solve for x
   x = 408,561,180.49/21,897
6. Step 6: Final answer
   x = 18,658.32