Finding the Fourth Proportional to 9,831.79, 13,567.80 and 5,355.54

Step by Step Solution

1. Step 1: Write the proportion equation
   9,831.79 : 13,567.80 = 5,355.54 : x
2. Step 2: Convert to fraction form
   9,831.79/13,567.80 = 5,355.54/x
3. Step 3: Cross multiply
   9,831.79x = 13,567.80 × 5,355.54
4. Step 4: Simplify right side
   9,831.79x = 72,662,858.82
5. Step 5: Solve for x
   x = 72,662,858.82/9,831.79
6. Step 6: Final answer
   x = 7,390.61