Finding the Fourth Proportional to 3,876.28, 5,352.27 and 2,978.60

Step by Step Solution

1. Step 1: Write the proportion equation
   3,876.28 : 5,352.27 = 2,978.60 : x
2. Step 2: Convert to fraction form
   3,876.28/5,352.27 = 2,978.60/x
3. Step 3: Cross multiply
   3,876.28x = 5,352.27 × 2,978.60
4. Step 4: Simplify right side
   3,876.28x = 15,942,250.02
5. Step 5: Solve for x
   x = 15,942,250.02/3,876.28
6. Step 6: Final answer
   x = 4,112.77