Finding the Fourth Proportional to 2,571.71, 3,857.52 and 840.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,571.71 : 3,857.52 = 840.34 : x
2. Step 2: Convert to fraction form
   2,571.71/3,857.52 = 840.34/x
3. Step 3: Cross multiply
   2,571.71x = 3,857.52 × 840.34
4. Step 4: Simplify right side
   2,571.71x = 3,241,609.07
5. Step 5: Solve for x
   x = 3,241,609.07/2,571.71
6. Step 6: Final answer
   x = 1,260.49