Finding the Fourth Proportional to 2,591.31, 3,886.25 and 859.95

Step by Step Solution

1. Step 1: Write the proportion equation
   2,591.31 : 3,886.25 = 859.95 : x
2. Step 2: Convert to fraction form
   2,591.31/3,886.25 = 859.95/x
3. Step 3: Cross multiply
   2,591.31x = 3,886.25 × 859.95
4. Step 4: Simplify right side
   2,591.31x = 3,341,976.39
5. Step 5: Solve for x
   x = 3,341,976.39/2,591.31
6. Step 6: Final answer
   x = 1,289.69