Finding the Fourth Proportional to 2,012.02, 3,017.76 and 857.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.02 : 3,017.76 = 857.50 : x
2. Step 2: Convert to fraction form
   2,012.02/3,017.76 = 857.50/x
3. Step 3: Cross multiply
   2,012.02x = 3,017.76 × 857.50
4. Step 4: Simplify right side
   2,012.02x = 2,587,729.20
5. Step 5: Solve for x
   x = 2,587,729.20/2,012.02
6. Step 6: Final answer
   x = 1,286.13