Finding the Fourth Proportional to 2,012.52, 3,017.34 and 857.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.52 : 3,017.34 = 857.64 : x
2. Step 2: Convert to fraction form
   2,012.52/3,017.34 = 857.64/x
3. Step 3: Cross multiply
   2,012.52x = 3,017.34 × 857.64
4. Step 4: Simplify right side
   2,012.52x = 2,587,791.48
5. Step 5: Solve for x
   x = 2,587,791.48/2,012.52
6. Step 6: Final answer
   x = 1,285.85