Finding the Fourth Proportional to 2,640.16, 3,958.50 and 994.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.16 : 3,958.50 = 994.72 : x
2. Step 2: Convert to fraction form
   2,640.16/3,958.50 = 994.72/x
3. Step 3: Cross multiply
   2,640.16x = 3,958.50 × 994.72
4. Step 4: Simplify right side
   2,640.16x = 3,937,599.12
5. Step 5: Solve for x
   x = 3,937,599.12/2,640.16
6. Step 6: Final answer
   x = 1,491.42