Finding the Fourth Proportional to 21,915.96, 30,245.24 and 12,482.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,915.96 : 30,245.24 = 12,482.72 : x
2. Step 2: Convert to fraction form
   21,915.96/30,245.24 = 12,482.72/x
3. Step 3: Cross multiply
   21,915.96x = 30,245.24 × 12,482.72
4. Step 4: Simplify right side
   21,915.96x = 377,542,862.25
5. Step 5: Solve for x
   x = 377,542,862.25/21,915.96
6. Step 6: Final answer
   x = 17,226.85