Finding the Fourth Proportional to 21,906.82, 30,231.39 and 11,970.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,906.82 : 30,231.39 = 11,970.82 : x
2. Step 2: Convert to fraction form
   21,906.82/30,231.39 = 11,970.82/x
3. Step 3: Cross multiply
   21,906.82x = 30,231.39 × 11,970.82
4. Step 4: Simplify right side
   21,906.82x = 361,894,528.04
5. Step 5: Solve for x
   x = 361,894,528.04/21,906.82
6. Step 6: Final answer
   x = 16,519.72