Finding the Fourth Proportional to 3,818.37, 5,268.17 and 2,139.55

Step by Step Solution

1. Step 1: Write the proportion equation
   3,818.37 : 5,268.17 = 2,139.55 : x
2. Step 2: Convert to fraction form
   3,818.37/5,268.17 = 2,139.55/x
3. Step 3: Cross multiply
   3,818.37x = 5,268.17 × 2,139.55
4. Step 4: Simplify right side
   3,818.37x = 11,271,505.30
5. Step 5: Solve for x
   x = 11,271,505.30/3,818.37
6. Step 6: Final answer
   x = 2,951.91