Finding the Fourth Proportional to 2,085.57, 3,125.75 and 852.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.57 : 3,125.75 = 852.30 : x
2. Step 2: Convert to fraction form
   2,085.57/3,125.75 = 852.30/x
3. Step 3: Cross multiply
   2,085.57x = 3,125.75 × 852.30
4. Step 4: Simplify right side
   2,085.57x = 2,664,072.46
5. Step 5: Solve for x
   x = 2,664,072.46/2,085.57
6. Step 6: Final answer
   x = 1,277.38