Finding the Fourth Proportional to 3,280.56, 4,920.48 and 1,089.42

Step by Step Solution

1. Step 1: Write the proportion equation
   3,280.56 : 4,920.48 = 1,089.42 : x
2. Step 2: Convert to fraction form
   3,280.56/4,920.48 = 1,089.42/x
3. Step 3: Cross multiply
   3,280.56x = 4,920.48 × 1,089.42
4. Step 4: Simplify right side
   3,280.56x = 5,360,469.32
5. Step 5: Solve for x
   x = 5,360,469.32/3,280.56
6. Step 6: Final answer
   x = 1,634.01