Finding the Fourth Proportional to 3,926.86, 5,419.15 and 2,158.54

Step by Step Solution

1. Step 1: Write the proportion equation
   3,926.86 : 5,419.15 = 2,158.54 : x
2. Step 2: Convert to fraction form
   3,926.86/5,419.15 = 2,158.54/x
3. Step 3: Cross multiply
   3,926.86x = 5,419.15 × 2,158.54
4. Step 4: Simplify right side
   3,926.86x = 11,697,433.10
5. Step 5: Solve for x
   x = 11,697,433.10/3,926.86
6. Step 6: Final answer
   x = 2,978.83