Finding the Fourth Proportional to 2,640.31, 3,958.05 and 995.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.31 : 3,958.05 = 995.74 : x
2. Step 2: Convert to fraction form
   2,640.31/3,958.05 = 995.74/x
3. Step 3: Cross multiply
   2,640.31x = 3,958.05 × 995.74
4. Step 4: Simplify right side
   2,640.31x = 3,941,188.71
5. Step 5: Solve for x
   x = 3,941,188.71/2,640.31
6. Step 6: Final answer
   x = 1,492.70