Finding the Fourth Proportional to 2,646.72, 3,968.82 and 1,085.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,646.72 : 3,968.82 = 1,085.40 : x
2. Step 2: Convert to fraction form
   2,646.72/3,968.82 = 1,085.40/x
3. Step 3: Cross multiply
   2,646.72x = 3,968.82 × 1,085.40
4. Step 4: Simplify right side
   2,646.72x = 4,307,757.23
5. Step 5: Solve for x
   x = 4,307,757.23/2,646.72
6. Step 6: Final answer
   x = 1,627.58