Finding the Fourth Proportional to 21,908.22, 30,234.51 and 12,479.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,908.22 : 30,234.51 = 12,479.82 : x
2. Step 2: Convert to fraction form
   21,908.22/30,234.51 = 12,479.82/x
3. Step 3: Cross multiply
   21,908.22x = 30,234.51 × 12,479.82
4. Step 4: Simplify right side
   21,908.22x = 377,321,242.59
5. Step 5: Solve for x
   x = 377,321,242.59/21,908.22
6. Step 6: Final answer
   x = 17,222.82