Finding the Fourth Proportional to 2,399.89, 3,599.81 and 668.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.89 : 3,599.81 = 668.51 : x
2. Step 2: Convert to fraction form
   2,399.89/3,599.81 = 668.51/x
3. Step 3: Cross multiply
   2,399.89x = 3,599.81 × 668.51
4. Step 4: Simplify right side
   2,399.89x = 2,406,508.98
5. Step 5: Solve for x
   x = 2,406,508.98/2,399.89
6. Step 6: Final answer
   x = 1,002.76