Finding the Fourth Proportional to 3,551.40, 5,325.72 and 1,085.44

Step by Step Solution

1. Step 1: Write the proportion equation
   3,551.40 : 5,325.72 = 1,085.44 : x
2. Step 2: Convert to fraction form
   3,551.40/5,325.72 = 1,085.44/x
3. Step 3: Cross multiply
   3,551.40x = 5,325.72 × 1,085.44
4. Step 4: Simplify right side
   3,551.40x = 5,780,749.52
5. Step 5: Solve for x
   x = 5,780,749.52/3,551.40
6. Step 6: Final answer
   x = 1,627.74