Finding the Fourth Proportional to 2,589.48, 3,884.06 and 858.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,589.48 : 3,884.06 = 858.28 : x
2. Step 2: Convert to fraction form
   2,589.48/3,884.06 = 858.28/x
3. Step 3: Cross multiply
   2,589.48x = 3,884.06 × 858.28
4. Step 4: Simplify right side
   2,589.48x = 3,333,611.02
5. Step 5: Solve for x
   x = 3,333,611.02/2,589.48
6. Step 6: Final answer
   x = 1,287.37