Finding the Fourth Proportional to 2,709.48, 4,064.76 and 860.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,709.48 : 4,064.76 = 860.28 : x
2. Step 2: Convert to fraction form
   2,709.48/4,064.76 = 860.28/x
3. Step 3: Cross multiply
   2,709.48x = 4,064.76 × 860.28
4. Step 4: Simplify right side
   2,709.48x = 3,496,831.73
5. Step 5: Solve for x
   x = 3,496,831.73/2,709.48
6. Step 6: Final answer
   x = 1,290.59