Finding the Fourth Proportional to 21,915.12, 30,239.82 and 12,483.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,915.12 : 30,239.82 = 12,483.48 : x
2. Step 2: Convert to fraction form
   21,915.12/30,239.82 = 12,483.48/x
3. Step 3: Cross multiply
   21,915.12x = 30,239.82 × 12,483.48
4. Step 4: Simplify right side
   21,915.12x = 377,498,188.17
5. Step 5: Solve for x
   x = 377,498,188.17/21,915.12
6. Step 6: Final answer
   x = 17,225.47