Finding the Fourth Proportional to 5,719.88, 7,890.64 and 3,831.89

Step by Step Solution

1. Step 1: Write the proportion equation
   5,719.88 : 7,890.64 = 3,831.89 : x
2. Step 2: Convert to fraction form
   5,719.88/7,890.64 = 3,831.89/x
3. Step 3: Cross multiply
   5,719.88x = 7,890.64 × 3,831.89
4. Step 4: Simplify right side
   5,719.88x = 30,236,015.48
5. Step 5: Solve for x
   x = 30,236,015.48/5,719.88
6. Step 6: Final answer
   x = 5,286.13