Finding the Fourth Proportional to 13,191.22, 19,788.78 and 3,831.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,191.22 : 19,788.78 = 3,831.31 : x
2. Step 2: Convert to fraction form
   13,191.22/19,788.78 = 3,831.31/x
3. Step 3: Cross multiply
   13,191.22x = 19,788.78 × 3,831.31
4. Step 4: Simplify right side
   13,191.22x = 75,816,950.70
5. Step 5: Solve for x
   x = 75,816,950.70/13,191.22
6. Step 6: Final answer
   x = 5,747.53