Finding the Fourth Proportional to 22,151, 30,568.38 and 12,720.18

Step by Step Solution

1. Step 1: Write the proportion equation
   22,151 : 30,568.38 = 12,720.18 : x
2. Step 2: Convert to fraction form
   22,151/30,568.38 = 12,720.18/x
3. Step 3: Cross multiply
   22,151x = 30,568.38 × 12,720.18
4. Step 4: Simplify right side
   22,151x = 388,835,295.91
5. Step 5: Solve for x
   x = 388,835,295.91/22,151
6. Step 6: Final answer
   x = 17,553.85