Finding the Fourth Proportional to 2,399.10, 3,598.89 and 859.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.10 : 3,598.89 = 859.74 : x
2. Step 2: Convert to fraction form
   2,399.10/3,598.89 = 859.74/x
3. Step 3: Cross multiply
   2,399.10x = 3,598.89 × 859.74
4. Step 4: Simplify right side
   2,399.10x = 3,094,109.69
5. Step 5: Solve for x
   x = 3,094,109.69/2,399.10
6. Step 6: Final answer
   x = 1,289.70