Finding the Fourth Proportional to 2,085.83, 3,128.69 and 852.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.83 : 3,128.69 = 852.92 : x
2. Step 2: Convert to fraction form
   2,085.83/3,128.69 = 852.92/x
3. Step 3: Cross multiply
   2,085.83x = 3,128.69 × 852.92
4. Step 4: Simplify right side
   2,085.83x = 2,668,502.37
5. Step 5: Solve for x
   x = 2,668,502.37/2,085.83
6. Step 6: Final answer
   x = 1,279.35