Finding the Fourth Proportional to 3,280.34, 4,921.14 and 1,089.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,280.34 : 4,921.14 = 1,089.20 : x
2. Step 2: Convert to fraction form
   3,280.34/4,921.14 = 1,089.20/x
3. Step 3: Cross multiply
   3,280.34x = 4,921.14 × 1,089.20
4. Step 4: Simplify right side
   3,280.34x = 5,360,105.69
5. Step 5: Solve for x
   x = 5,360,105.69/3,280.34
6. Step 6: Final answer
   x = 1,634.01