Finding the Fourth Proportional to 2,639.40, 3,956.76 and 995.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.40 : 3,956.76 = 995.52 : x
2. Step 2: Convert to fraction form
   2,639.40/3,956.76 = 995.52/x
3. Step 3: Cross multiply
   2,639.40x = 3,956.76 × 995.52
4. Step 4: Simplify right side
   2,639.40x = 3,939,033.72
5. Step 5: Solve for x
   x = 3,939,033.72/2,639.40
6. Step 6: Final answer
   x = 1,492.40