Finding the Fourth Proportional to 2,571.75, 3,857.83 and 840.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,571.75 : 3,857.83 = 840.38 : x
2. Step 2: Convert to fraction form
   2,571.75/3,857.83 = 840.38/x
3. Step 3: Cross multiply
   2,571.75x = 3,857.83 × 840.38
4. Step 4: Simplify right side
   2,571.75x = 3,242,021.79
5. Step 5: Solve for x
   x = 3,242,021.79/2,571.75
6. Step 6: Final answer
   x = 1,260.63