Finding the Fourth Proportional to 2,399.05, 3,598.04 and 860.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.05 : 3,598.04 = 860.05 : x
2. Step 2: Convert to fraction form
   2,399.05/3,598.04 = 860.05/x
3. Step 3: Cross multiply
   2,399.05x = 3,598.04 × 860.05
4. Step 4: Simplify right side
   2,399.05x = 3,094,496.11
5. Step 5: Solve for x
   x = 3,094,496.11/2,399.05
6. Step 6: Final answer
   x = 1,289.88