Finding the Fourth Proportional to 3,926.52, 5,419.06 and 2,158.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,926.52 : 5,419.06 = 2,158.30 : x
2. Step 2: Convert to fraction form
   3,926.52/5,419.06 = 2,158.30/x
3. Step 3: Cross multiply
   3,926.52x = 5,419.06 × 2,158.30
4. Step 4: Simplify right side
   3,926.52x = 11,695,957.20
5. Step 5: Solve for x
   x = 11,695,957.20/3,926.52
6. Step 6: Final answer
   x = 2,978.71