Finding the Fourth Proportional to 3,978.28, 5,977.50 and 2,518.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.28 : 5,977.50 = 2,518.12 : x
2. Step 2: Convert to fraction form
   3,978.28/5,977.50 = 2,518.12/x
3. Step 3: Cross multiply
   3,978.28x = 5,977.50 × 2,518.12
4. Step 4: Simplify right side
   3,978.28x = 15,052,062.30
5. Step 5: Solve for x
   x = 15,052,062.30/3,978.28
6. Step 6: Final answer
   x = 3,783.56