Finding the Fourth Proportional to 2,616.56, 3,924.88 and 668.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,616.56 : 3,924.88 = 668.72 : x
2. Step 2: Convert to fraction form
   2,616.56/3,924.88 = 668.72/x
3. Step 3: Cross multiply
   2,616.56x = 3,924.88 × 668.72
4. Step 4: Simplify right side
   2,616.56x = 2,624,645.75
5. Step 5: Solve for x
   x = 2,624,645.75/2,616.56
6. Step 6: Final answer
   x = 1,003.09