Finding the Fourth Proportional to 9,831.60, 13,567.64 and 5,355.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,831.60 : 13,567.64 = 5,355.31 : x
2. Step 2: Convert to fraction form
   9,831.60/13,567.64 = 5,355.31/x
3. Step 3: Cross multiply
   9,831.60x = 13,567.64 × 5,355.31
4. Step 4: Simplify right side
   9,831.60x = 72,658,843.64
5. Step 5: Solve for x
   x = 72,658,843.64/9,831.60
6. Step 6: Final answer
   x = 7,390.34