Finding the Fourth Proportional to 3,926.72, 5,419.12 and 2,158.48

Step by Step Solution

1. Step 1: Write the proportion equation
   3,926.72 : 5,419.12 = 2,158.48 : x
2. Step 2: Convert to fraction form
   3,926.72/5,419.12 = 2,158.48/x
3. Step 3: Cross multiply
   3,926.72x = 5,419.12 × 2,158.48
4. Step 4: Simplify right side
   3,926.72x = 11,697,062.14
5. Step 5: Solve for x
   x = 11,697,062.14/3,926.72
6. Step 6: Final answer
   x = 2,978.84