Finding the Fourth Proportional to 2,012.38, 3,019.86 and 858.14

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.38 : 3,019.86 = 858.14 : x
2. Step 2: Convert to fraction form
   2,012.38/3,019.86 = 858.14/x
3. Step 3: Cross multiply
   2,012.38x = 3,019.86 × 858.14
4. Step 4: Simplify right side
   2,012.38x = 2,591,462.66
5. Step 5: Solve for x
   x = 2,591,462.66/2,012.38
6. Step 6: Final answer
   x = 1,287.76