Finding the Fourth Proportional to 3,926.56, 5,418.56 and 2,158.04

Step by Step Solution

1. Step 1: Write the proportion equation
   3,926.56 : 5,418.56 = 2,158.04 : x
2. Step 2: Convert to fraction form
   3,926.56/5,418.56 = 2,158.04/x
3. Step 3: Cross multiply
   3,926.56x = 5,418.56 × 2,158.04
4. Step 4: Simplify right side
   3,926.56x = 11,693,469.22
5. Step 5: Solve for x
   x = 11,693,469.22/3,926.56
6. Step 6: Final answer
   x = 2,978.04