Finding the Fourth Proportional to 21,906.72, 30,234.24 and 12,476.16

Step by Step Solution

1. Step 1: Write the proportion equation
   21,906.72 : 30,234.24 = 12,476.16 : x
2. Step 2: Convert to fraction form
   21,906.72/30,234.24 = 12,476.16/x
3. Step 3: Cross multiply
   21,906.72x = 30,234.24 × 12,476.16
4. Step 4: Simplify right side
   21,906.72x = 377,207,215.72
5. Step 5: Solve for x
   x = 377,207,215.72/21,906.72
6. Step 6: Final answer
   x = 17,218.79