Finding the Fourth Proportional to 21,910.72, 30,239.76 and 12,480.16

Step by Step Solution

1. Step 1: Write the proportion equation
   21,910.72 : 30,239.76 = 12,480.16 : x
2. Step 2: Convert to fraction form
   21,910.72/30,239.76 = 12,480.16/x
3. Step 3: Cross multiply
   21,910.72x = 30,239.76 × 12,480.16
4. Step 4: Simplify right side
   21,910.72x = 377,397,043.16
5. Step 5: Solve for x
   x = 377,397,043.16/21,910.72
6. Step 6: Final answer
   x = 17,224.31