Finding the Fourth Proportional to 2,709.62, 4,064.56 and 860.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,709.62 : 4,064.56 = 860.86 : x
2. Step 2: Convert to fraction form
   2,709.62/4,064.56 = 860.86/x
3. Step 3: Cross multiply
   2,709.62x = 4,064.56 × 860.86
4. Step 4: Simplify right side
   2,709.62x = 3,499,017.12
5. Step 5: Solve for x
   x = 3,499,017.12/2,709.62
6. Step 6: Final answer
   x = 1,291.33