Finding the Fourth Proportional to 9,831.85, 13,568.12 and 5,355.61

Step by Step Solution

1. Step 1: Write the proportion equation
   9,831.85 : 13,568.12 = 5,355.61 : x
2. Step 2: Convert to fraction form
   9,831.85/13,568.12 = 5,355.61/x
3. Step 3: Cross multiply
   9,831.85x = 13,568.12 × 5,355.61
4. Step 4: Simplify right side
   9,831.85x = 72,665,498.45
5. Step 5: Solve for x
   x = 72,665,498.45/9,831.85
6. Step 6: Final answer
   x = 7,390.83