Finding the Fourth Proportional to 2,085.75, 3,129.30 and 852.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.75 : 3,129.30 = 852.49 : x
2. Step 2: Convert to fraction form
   2,085.75/3,129.30 = 852.49/x
3. Step 3: Cross multiply
   2,085.75x = 3,129.30 × 852.49
4. Step 4: Simplify right side
   2,085.75x = 2,667,696.96
5. Step 5: Solve for x
   x = 2,667,696.96/2,085.75
6. Step 6: Final answer
   x = 1,279.01