Finding the Fourth Proportional to 1,103.82, 1,647.46 and 1,085.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.82 : 1,647.46 = 1,085.59 : x
2. Step 2: Convert to fraction form
   1,103.82/1,647.46 = 1,085.59/x
3. Step 3: Cross multiply
   1,103.82x = 1,647.46 × 1,085.59
4. Step 4: Simplify right side
   1,103.82x = 1,788,466.10
5. Step 5: Solve for x
   x = 1,788,466.10/1,103.82
6. Step 6: Final answer
   x = 1,620.25