Finding the Fourth Proportional to 2,571.98, 3,857.04 and 928.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,571.98 : 3,857.04 = 928.09 : x
2. Step 2: Convert to fraction form
   2,571.98/3,857.04 = 928.09/x
3. Step 3: Cross multiply
   2,571.98x = 3,857.04 × 928.09
4. Step 4: Simplify right side
   2,571.98x = 3,579,680.25
5. Step 5: Solve for x
   x = 3,579,680.25/2,571.98
6. Step 6: Final answer
   x = 1,391.80