Finding the Fourth Proportional to 2,647.40, 3,967.65 and 1,085.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,647.40 : 3,967.65 = 1,085.59 : x
2. Step 2: Convert to fraction form
   2,647.40/3,967.65 = 1,085.59/x
3. Step 3: Cross multiply
   2,647.40x = 3,967.65 × 1,085.59
4. Step 4: Simplify right side
   2,647.40x = 4,307,231.24
5. Step 5: Solve for x
   x = 4,307,231.24/2,647.40
6. Step 6: Final answer
   x = 1,626.97