Finding the Fourth Proportional to 22,198.56, 30,632.82 and 12,640.80

Step by Step Solution

1. Step 1: Write the proportion equation
   22,198.56 : 30,632.82 = 12,640.80 : x
2. Step 2: Convert to fraction form
   22,198.56/30,632.82 = 12,640.80/x
3. Step 3: Cross multiply
   22,198.56x = 30,632.82 × 12,640.80
4. Step 4: Simplify right side
   22,198.56x = 387,223,351.06
5. Step 5: Solve for x
   x = 387,223,351.06/22,198.56
6. Step 6: Final answer
   x = 17,443.62