Finding the Fourth Proportional to 2,405.80, 3,608.56 and 1,089.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,405.80 : 3,608.56 = 1,089.24 : x
2. Step 2: Convert to fraction form
   2,405.80/3,608.56 = 1,089.24/x
3. Step 3: Cross multiply
   2,405.80x = 3,608.56 × 1,089.24
4. Step 4: Simplify right side
   2,405.80x = 3,930,587.89
5. Step 5: Solve for x
   x = 3,930,587.89/2,405.80
6. Step 6: Final answer
   x = 1,633.80