Finding the Fourth Proportional to 2,591.25, 3,887.49 and 859.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,591.25 : 3,887.49 = 859.88 : x
2. Step 2: Convert to fraction form
   2,591.25/3,887.49 = 859.88/x
3. Step 3: Cross multiply
   2,591.25x = 3,887.49 × 859.88
4. Step 4: Simplify right side
   2,591.25x = 3,342,755.46
5. Step 5: Solve for x
   x = 3,342,755.46/2,591.25
6. Step 6: Final answer
   x = 1,290.02