Finding the Fourth Proportional to 2,085.24, 3,128.52 and 851.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.24 : 3,128.52 = 851.92 : x
2. Step 2: Convert to fraction form
   2,085.24/3,128.52 = 851.92/x
3. Step 3: Cross multiply
   2,085.24x = 3,128.52 × 851.92
4. Step 4: Simplify right side
   2,085.24x = 2,665,244.13
5. Step 5: Solve for x
   x = 2,665,244.13/2,085.24
6. Step 6: Final answer
   x = 1,278.15