Finding the Fourth Proportional to 2,820.27, 4,230.31 and 1,340.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,820.27 : 4,230.31 = 1,340.55 : x
2. Step 2: Convert to fraction form
   2,820.27/4,230.31 = 1,340.55/x
3. Step 3: Cross multiply
   2,820.27x = 4,230.31 × 1,340.55
4. Step 4: Simplify right side
   2,820.27x = 5,670,952.65
5. Step 5: Solve for x
   x = 5,670,952.65/2,820.27
6. Step 6: Final answer
   x = 2,010.79