Finding the Fourth Proportional to 21,906.85, 30,231.42 and 12,475.41

Step by Step Solution

1. Step 1: Write the proportion equation
   21,906.85 : 30,231.42 = 12,475.41 : x
2. Step 2: Convert to fraction form
   21,906.85/30,231.42 = 12,475.41/x
3. Step 3: Cross multiply
   21,906.85x = 30,231.42 × 12,475.41
4. Step 4: Simplify right side
   21,906.85x = 377,149,359.38
5. Step 5: Solve for x
   x = 377,149,359.38/21,906.85
6. Step 6: Final answer
   x = 17,216.05