Finding the Fourth Proportional to 2,399.09, 3,600.23 and 860.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.09 : 3,600.23 = 860.09 : x
2. Step 2: Convert to fraction form
   2,399.09/3,600.23 = 860.09/x
3. Step 3: Cross multiply
   2,399.09x = 3,600.23 × 860.09
4. Step 4: Simplify right side
   2,399.09x = 3,096,499.52
5. Step 5: Solve for x
   x = 3,096,499.52/2,399.09
6. Step 6: Final answer
   x = 1,290.70