Finding the Fourth Proportional to 2,660.80, 3,993.02 and 1,018.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,660.80 : 3,993.02 = 1,018.72 : x
2. Step 2: Convert to fraction form
   2,660.80/3,993.02 = 1,018.72/x
3. Step 3: Cross multiply
   2,660.80x = 3,993.02 × 1,018.72
4. Step 4: Simplify right side
   2,660.80x = 4,067,769.33
5. Step 5: Solve for x
   x = 4,067,769.33/2,660.80
6. Step 6: Final answer
   x = 1,528.78