Finding the Fourth Proportional to 2,086.75, 3,128.76 and 852.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.75 : 3,128.76 = 852.92 : x
2. Step 2: Convert to fraction form
   2,086.75/3,128.76 = 852.92/x
3. Step 3: Cross multiply
   2,086.75x = 3,128.76 × 852.92
4. Step 4: Simplify right side
   2,086.75x = 2,668,578.07
5. Step 5: Solve for x
   x = 2,668,578.07/2,086.75
6. Step 6: Final answer
   x = 1,278.82