Finding the Fourth Proportional to 3,978.40, 5,500.56 and 2,745.76

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.40 : 5,500.56 = 2,745.76 : x
2. Step 2: Convert to fraction form
   3,978.40/5,500.56 = 2,745.76/x
3. Step 3: Cross multiply
   3,978.40x = 5,500.56 × 2,745.76
4. Step 4: Simplify right side
   3,978.40x = 15,103,217.63
5. Step 5: Solve for x
   x = 15,103,217.63/3,978.40
6. Step 6: Final answer
   x = 3,796.30