Finding the Fourth Proportional to 22,152.92, 30,573.78 and 12,721.28

Step by Step Solution

1. Step 1: Write the proportion equation
   22,152.92 : 30,573.78 = 12,721.28 : x
2. Step 2: Convert to fraction form
   22,152.92/30,573.78 = 12,721.28/x
3. Step 3: Cross multiply
   22,152.92x = 30,573.78 × 12,721.28
4. Step 4: Simplify right side
   22,152.92x = 388,937,616.04
5. Step 5: Solve for x
   x = 388,937,616.04/22,152.92
6. Step 6: Final answer
   x = 17,556.95