Finding the Fourth Proportional to 21,042.72, 31,568.37 and 8,562.65

Step by Step Solution

1. Step 1: Write the proportion equation
   21,042.72 : 31,568.37 = 8,562.65 : x
2. Step 2: Convert to fraction form
   21,042.72/31,568.37 = 8,562.65/x
3. Step 3: Cross multiply
   21,042.72x = 31,568.37 × 8,562.65
4. Step 4: Simplify right side
   21,042.72x = 270,308,745.54
5. Step 5: Solve for x
   x = 270,308,745.54/21,042.72
6. Step 6: Final answer
   x = 12,845.71