Finding the Fourth Proportional to 2,589.72, 3,884.76 and 859.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,589.72 : 3,884.76 = 859.56 : x
2. Step 2: Convert to fraction form
   2,589.72/3,884.76 = 859.56/x
3. Step 3: Cross multiply
   2,589.72x = 3,884.76 × 859.56
4. Step 4: Simplify right side
   2,589.72x = 3,339,184.31
5. Step 5: Solve for x
   x = 3,339,184.31/2,589.72
6. Step 6: Final answer
   x = 1,289.40