Finding the Fourth Proportional to 2,638.62, 3,958.38 and 995.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.62 : 3,958.38 = 995.40 : x
2. Step 2: Convert to fraction form
   2,638.62/3,958.38 = 995.40/x
3. Step 3: Cross multiply
   2,638.62x = 3,958.38 × 995.40
4. Step 4: Simplify right side
   2,638.62x = 3,940,171.45
5. Step 5: Solve for x
   x = 3,940,171.45/2,638.62
6. Step 6: Final answer
   x = 1,493.27