Finding the Fourth Proportional to 20,721.83, 31,076.59 and 7,571.12

Step by Step Solution

1. Step 1: Write the proportion equation
   20,721.83 : 31,076.59 = 7,571.12 : x
2. Step 2: Convert to fraction form
   20,721.83/31,076.59 = 7,571.12/x
3. Step 3: Cross multiply
   20,721.83x = 31,076.59 × 7,571.12
4. Step 4: Simplify right side
   20,721.83x = 235,284,585.48
5. Step 5: Solve for x
   x = 235,284,585.48/20,721.83
6. Step 6: Final answer
   x = 11,354.43