Finding the Fourth Proportional to 2,399.67, 3,599.37 and 839.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.67 : 3,599.37 = 839.07 : x
2. Step 2: Convert to fraction form
   2,399.67/3,599.37 = 839.07/x
3. Step 3: Cross multiply
   2,399.67x = 3,599.37 × 839.07
4. Step 4: Simplify right side
   2,399.67x = 3,020,123.39
5. Step 5: Solve for x
   x = 3,020,123.39/2,399.67
6. Step 6: Final answer
   x = 1,258.56