Finding the Fourth Proportional to 2,018.72, 3,027.60 and 865.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,018.72 : 3,027.60 = 865.28 : x
2. Step 2: Convert to fraction form
   2,018.72/3,027.60 = 865.28/x
3. Step 3: Cross multiply
   2,018.72x = 3,027.60 × 865.28
4. Step 4: Simplify right side
   2,018.72x = 2,619,721.73
5. Step 5: Solve for x
   x = 2,619,721.73/2,018.72
6. Step 6: Final answer
   x = 1,297.71