Finding the Fourth Proportional to 2,012.31, 3,016.44 and 858.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.31 : 3,016.44 = 858.87 : x
2. Step 2: Convert to fraction form
   2,012.31/3,016.44 = 858.87/x
3. Step 3: Cross multiply
   2,012.31x = 3,016.44 × 858.87
4. Step 4: Simplify right side
   2,012.31x = 2,590,729.82
5. Step 5: Solve for x
   x = 2,590,729.82/2,012.31
6. Step 6: Final answer
   x = 1,287.44