Finding the Fourth Proportional to 21,906.18, 30,230.82 and 12,474.78

Step by Step Solution

1. Step 1: Write the proportion equation
   21,906.18 : 30,230.82 = 12,474.78 : x
2. Step 2: Convert to fraction form
   21,906.18/30,230.82 = 12,474.78/x
3. Step 3: Cross multiply
   21,906.18x = 30,230.82 × 12,474.78
4. Step 4: Simplify right side
   21,906.18x = 377,122,828.72
5. Step 5: Solve for x
   x = 377,122,828.72/21,906.18
6. Step 6: Final answer
   x = 17,215.36