Finding the Fourth Proportional to 2,571.10, 3,856.92 and 839.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,571.10 : 3,856.92 = 839.50 : x
2. Step 2: Convert to fraction form
   2,571.10/3,856.92 = 839.50/x
3. Step 3: Cross multiply
   2,571.10x = 3,856.92 × 839.50
4. Step 4: Simplify right side
   2,571.10x = 3,237,884.34
5. Step 5: Solve for x
   x = 3,237,884.34/2,571.10
6. Step 6: Final answer
   x = 1,259.34