Finding the Fourth Proportional to 2,085.98, 3,128.52 and 852.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.98 : 3,128.52 = 852.18 : x
2. Step 2: Convert to fraction form
   2,085.98/3,128.52 = 852.18/x
3. Step 3: Cross multiply
   2,085.98x = 3,128.52 × 852.18
4. Step 4: Simplify right side
   2,085.98x = 2,666,062.17
5. Step 5: Solve for x
   x = 2,666,062.17/2,085.98
6. Step 6: Final answer
   x = 1,278.09