Finding the Fourth Proportional to 2,818.40, 4,228.34 and 1,086.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,818.40 : 4,228.34 = 1,086.56 : x
2. Step 2: Convert to fraction form
   2,818.40/4,228.34 = 1,086.56/x
3. Step 3: Cross multiply
   2,818.40x = 4,228.34 × 1,086.56
4. Step 4: Simplify right side
   2,818.40x = 4,594,345.11
5. Step 5: Solve for x
   x = 4,594,345.11/2,818.40
6. Step 6: Final answer
   x = 1,630.13