Finding the Fourth Proportional to 3,550.39, 5,325.59 and 1,085.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,550.39 : 5,325.59 = 1,085.20 : x
2. Step 2: Convert to fraction form
   3,550.39/5,325.59 = 1,085.20/x
3. Step 3: Cross multiply
   3,550.39x = 5,325.59 × 1,085.20
4. Step 4: Simplify right side
   3,550.39x = 5,779,312.18
5. Step 5: Solve for x
   x = 5,779,312.18/3,550.39
6. Step 6: Final answer
   x = 1,627.80