Finding the Fourth Proportional to 3,906.63, 5,390.82 and 2,228.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,906.63 : 5,390.82 = 2,228.31 : x
2. Step 2: Convert to fraction form
   3,906.63/5,390.82 = 2,228.31/x
3. Step 3: Cross multiply
   3,906.63x = 5,390.82 × 2,228.31
4. Step 4: Simplify right side
   3,906.63x = 12,012,418.11
5. Step 5: Solve for x
   x = 12,012,418.11/3,906.63
6. Step 6: Final answer
   x = 3,074.88