Finding the Fourth Proportional to 2,721.07, 4,082.55 and 1,078.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,721.07 : 4,082.55 = 1,078.12 : x
2. Step 2: Convert to fraction form
   2,721.07/4,082.55 = 1,078.12/x
3. Step 3: Cross multiply
   2,721.07x = 4,082.55 × 1,078.12
4. Step 4: Simplify right side
   2,721.07x = 4,401,478.81
5. Step 5: Solve for x
   x = 4,401,478.81/2,721.07
6. Step 6: Final answer
   x = 1,617.55