Finding the Fourth Proportional to 21,978.48, 30,330.33 and 11,906.94

Step by Step Solution

1. Step 1: Write the proportion equation
   21,978.48 : 30,330.33 = 11,906.94 : x
2. Step 2: Convert to fraction form
   21,978.48/30,330.33 = 11,906.94/x
3. Step 3: Cross multiply
   21,978.48x = 30,330.33 × 11,906.94
4. Step 4: Simplify right side
   21,978.48x = 361,141,419.49
5. Step 5: Solve for x
   x = 361,141,419.49/21,978.48
6. Step 6: Final answer
   x = 16,431.59