Finding the Fourth Proportional to 22,287.24, 30,756.78 and 12,215

Step by Step Solution

1. Step 1: Write the proportion equation
   22,287.24 : 30,756.78 = 12,215 : x
2. Step 2: Convert to fraction form
   22,287.24/30,756.78 = 12,215/x
3. Step 3: Cross multiply
   22,287.24x = 30,756.78 × 12,215
4. Step 4: Simplify right side
   22,287.24x = 375,694,067.70
5. Step 5: Solve for x
   x = 375,694,067.70/22,287.24
6. Step 6: Final answer
   x = 16,856.91