Finding the Fourth Proportional to 1,589.31, 2,384.86 and 858.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,589.31 : 2,384.86 = 858.87 : x
2. Step 2: Convert to fraction form
   1,589.31/2,384.86 = 858.87/x
3. Step 3: Cross multiply
   1,589.31x = 2,384.86 × 858.87
4. Step 4: Simplify right side
   1,589.31x = 2,048,284.71
5. Step 5: Solve for x
   x = 2,048,284.71/1,589.31
6. Step 6: Final answer
   x = 1,288.79