Finding the Fourth Proportional to 2,617.56, 3,926.38 and 669.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,617.56 : 3,926.38 = 669.72 : x
2. Step 2: Convert to fraction form
   2,617.56/3,926.38 = 669.72/x
3. Step 3: Cross multiply
   2,617.56x = 3,926.38 × 669.72
4. Step 4: Simplify right side
   2,617.56x = 2,629,575.21
5. Step 5: Solve for x
   x = 2,629,575.21/2,617.56
6. Step 6: Final answer
   x = 1,004.59