Finding the Fourth Proportional to 2,616.72, 3,924.66 and 668.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,616.72 : 3,924.66 = 668.82 : x
2. Step 2: Convert to fraction form
   2,616.72/3,924.66 = 668.82/x
3. Step 3: Cross multiply
   2,616.72x = 3,924.66 × 668.82
4. Step 4: Simplify right side
   2,616.72x = 2,624,891.10
5. Step 5: Solve for x
   x = 2,624,891.10/2,616.72
6. Step 6: Final answer
   x = 1,003.12