Finding the Fourth Proportional to 2,613.23, 3,919.82 and 665.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,613.23 : 3,919.82 = 665.42 : x
2. Step 2: Convert to fraction form
   2,613.23/3,919.82 = 665.42/x
3. Step 3: Cross multiply
   2,613.23x = 3,919.82 × 665.42
4. Step 4: Simplify right side
   2,613.23x = 2,608,333.10
5. Step 5: Solve for x
   x = 2,608,333.10/2,613.23
6. Step 6: Final answer
   x = 998.13