Finding the Fourth Proportional to 2,591.46, 3,885.93 and 859.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,591.46 : 3,885.93 = 859.50 : x
2. Step 2: Convert to fraction form
   2,591.46/3,885.93 = 859.50/x
3. Step 3: Cross multiply
   2,591.46x = 3,885.93 × 859.50
4. Step 4: Simplify right side
   2,591.46x = 3,339,956.84
5. Step 5: Solve for x
   x = 3,339,956.84/2,591.46
6. Step 6: Final answer
   x = 1,288.83