Finding the Fourth Proportional to 3,280.17, 4,920.61 and 1,089.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,280.17 : 4,920.61 = 1,089.12 : x
2. Step 2: Convert to fraction form
   3,280.17/4,920.61 = 1,089.12/x
3. Step 3: Cross multiply
   3,280.17x = 4,920.61 × 1,089.12
4. Step 4: Simplify right side
   3,280.17x = 5,359,134.76
5. Step 5: Solve for x
   x = 5,359,134.76/3,280.17
6. Step 6: Final answer
   x = 1,633.80