Finding the Fourth Proportional to 21,948.72, 30,285 and 12,517.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,948.72 : 30,285 = 12,517.04 : x
2. Step 2: Convert to fraction form
   21,948.72/30,285 = 12,517.04/x
3. Step 3: Cross multiply
   21,948.72x = 30,285 × 12,517.04
4. Step 4: Simplify right side
   21,948.72x = 379,078,556.40
5. Step 5: Solve for x
   x = 379,078,556.40/21,948.72
6. Step 6: Final answer
   x = 17,271.10