Finding the Fourth Proportional to 2,639.48, 3,957.42 and 995.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.48 : 3,957.42 = 995.72 : x
2. Step 2: Convert to fraction form
   2,639.48/3,957.42 = 995.72/x
3. Step 3: Cross multiply
   2,639.48x = 3,957.42 × 995.72
4. Step 4: Simplify right side
   2,639.48x = 3,940,482.24
5. Step 5: Solve for x
   x = 3,940,482.24/2,639.48
6. Step 6: Final answer
   x = 1,492.90