Finding the Fourth Proportional to 3,890.72, 5,831.22 and 2,778.42

Step by Step Solution

1. Step 1: Write the proportion equation
   3,890.72 : 5,831.22 = 2,778.42 : x
2. Step 2: Convert to fraction form
   3,890.72/5,831.22 = 2,778.42/x
3. Step 3: Cross multiply
   3,890.72x = 5,831.22 × 2,778.42
4. Step 4: Simplify right side
   3,890.72x = 16,201,578.27
5. Step 5: Solve for x
   x = 16,201,578.27/3,890.72
6. Step 6: Final answer
   x = 4,164.16