Finding the Fourth Proportional to 22,146.72, 30,568.48 and 12,721.60

Step by Step Solution

1. Step 1: Write the proportion equation
   22,146.72 : 30,568.48 = 12,721.60 : x
2. Step 2: Convert to fraction form
   22,146.72/30,568.48 = 12,721.60/x
3. Step 3: Cross multiply
   22,146.72x = 30,568.48 × 12,721.60
4. Step 4: Simplify right side
   22,146.72x = 388,879,975.17
5. Step 5: Solve for x
   x = 388,879,975.17/22,146.72
6. Step 6: Final answer
   x = 17,559.26