Finding the Fourth Proportional to 3,926.37, 5,418.37 and 2,158.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,926.37 : 5,418.37 = 2,158.05 : x
2. Step 2: Convert to fraction form
   3,926.37/5,418.37 = 2,158.05/x
3. Step 3: Cross multiply
   3,926.37x = 5,418.37 × 2,158.05
4. Step 4: Simplify right side
   3,926.37x = 11,693,080.89
5. Step 5: Solve for x
   x = 11,693,080.89/3,926.37
6. Step 6: Final answer
   x = 2,978.09