Finding the Fourth Proportional to 2,012.50, 3,019.97 and 858.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.50 : 3,019.97 = 858.25 : x
2. Step 2: Convert to fraction form
   2,012.50/3,019.97 = 858.25/x
3. Step 3: Cross multiply
   2,012.50x = 3,019.97 × 858.25
4. Step 4: Simplify right side
   2,012.50x = 2,591,889.25
5. Step 5: Solve for x
   x = 2,591,889.25/2,012.50
6. Step 6: Final answer
   x = 1,287.90