Finding the Fourth Proportional to 2,591.09, 3,885.79 and 859.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,591.09 : 3,885.79 = 859.25 : x
2. Step 2: Convert to fraction form
   2,591.09/3,885.79 = 859.25/x
3. Step 3: Cross multiply
   2,591.09x = 3,885.79 × 859.25
4. Step 4: Simplify right side
   2,591.09x = 3,338,865.06
5. Step 5: Solve for x
   x = 3,338,865.06/2,591.09
6. Step 6: Final answer
   x = 1,288.59