Finding the Fourth Proportional to 21,851.42, 30,154.92 and 11,915.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,851.42 : 30,154.92 = 11,915.42 : x
2. Step 2: Convert to fraction form
   21,851.42/30,154.92 = 11,915.42/x
3. Step 3: Cross multiply
   21,851.42x = 30,154.92 × 11,915.42
4. Step 4: Simplify right side
   21,851.42x = 359,308,536.87
5. Step 5: Solve for x
   x = 359,308,536.87/21,851.42
6. Step 6: Final answer
   x = 16,443.26