Finding the Fourth Proportional to 21,986.78, 30,341.59 and 11,915.24

Step by Step Solution

1. Step 1: Write the proportion equation
   21,986.78 : 30,341.59 = 11,915.24 : x
2. Step 2: Convert to fraction form
   21,986.78/30,341.59 = 11,915.24/x
3. Step 3: Cross multiply
   21,986.78x = 30,341.59 × 11,915.24
4. Step 4: Simplify right side
   21,986.78x = 361,527,145.34
5. Step 5: Solve for x
   x = 361,527,145.34/21,986.78
6. Step 6: Final answer
   x = 16,442.94