Finding the Fourth Proportional to 3,906.78, 5,390.10 and 2,227.92

Step by Step Solution

1. Step 1: Write the proportion equation
   3,906.78 : 5,390.10 = 2,227.92 : x
2. Step 2: Convert to fraction form
   3,906.78/5,390.10 = 2,227.92/x
3. Step 3: Cross multiply
   3,906.78x = 5,390.10 × 2,227.92
4. Step 4: Simplify right side
   3,906.78x = 12,008,711.59
5. Step 5: Solve for x
   x = 12,008,711.59/3,906.78
6. Step 6: Final answer
   x = 3,073.81