Finding the Fourth Proportional to 3,906.42, 5,390.23 and 2,227.87

Step by Step Solution

1. Step 1: Write the proportion equation
   3,906.42 : 5,390.23 = 2,227.87 : x
2. Step 2: Convert to fraction form
   3,906.42/5,390.23 = 2,227.87/x
3. Step 3: Cross multiply
   3,906.42x = 5,390.23 × 2,227.87
4. Step 4: Simplify right side
   3,906.42x = 12,008,693.62
5. Step 5: Solve for x
   x = 12,008,693.62/3,906.42
6. Step 6: Final answer
   x = 3,074.09