Finding the Fourth Proportional to 11,831.27, 17,721.45 and 5,581.91

Step by Step Solution

1. Step 1: Write the proportion equation
   11,831.27 : 17,721.45 = 5,581.91 : x
2. Step 2: Convert to fraction form
   11,831.27/17,721.45 = 5,581.91/x
3. Step 3: Cross multiply
   11,831.27x = 17,721.45 × 5,581.91
4. Step 4: Simplify right side
   11,831.27x = 98,919,583.27
5. Step 5: Solve for x
   x = 98,919,583.27/11,831.27
6. Step 6: Final answer
   x = 8,360.86