Finding the Fourth Proportional to 2,709.55, 4,064.47 and 860.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,709.55 : 4,064.47 = 860.81 : x
2. Step 2: Convert to fraction form
   2,709.55/4,064.47 = 860.81/x
3. Step 3: Cross multiply
   2,709.55x = 4,064.47 × 860.81
4. Step 4: Simplify right side
   2,709.55x = 3,498,736.42
5. Step 5: Solve for x
   x = 3,498,736.42/2,709.55
6. Step 6: Final answer
   x = 1,291.26