Finding the Fourth Proportional to 2,636.17, 3,951.92 and 992.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,636.17 : 3,951.92 = 992.79 : x
2. Step 2: Convert to fraction form
   2,636.17/3,951.92 = 992.79/x
3. Step 3: Cross multiply
   2,636.17x = 3,951.92 × 992.79
4. Step 4: Simplify right side
   2,636.17x = 3,923,429.14
5. Step 5: Solve for x
   x = 3,923,429.14/2,636.17
6. Step 6: Final answer
   x = 1,488.31