Finding the Fourth Proportional to 2,643.93, 3,962.45 and 1,082.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,643.93 : 3,962.45 = 1,082.15 : x
2. Step 2: Convert to fraction form
   2,643.93/3,962.45 = 1,082.15/x
3. Step 3: Cross multiply
   2,643.93x = 3,962.45 × 1,082.15
4. Step 4: Simplify right side
   2,643.93x = 4,287,940.04
5. Step 5: Solve for x
   x = 4,287,940.04/2,643.93
6. Step 6: Final answer
   x = 1,621.81