Finding the Fourth Proportional to 2,581.47, 3,873.02 and 851.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,581.47 : 3,873.02 = 851.31 : x
2. Step 2: Convert to fraction form
   2,581.47/3,873.02 = 851.31/x
3. Step 3: Cross multiply
   2,581.47x = 3,873.02 × 851.31
4. Step 4: Simplify right side
   2,581.47x = 3,297,136.40
5. Step 5: Solve for x
   x = 3,297,136.40/2,581.47
6. Step 6: Final answer
   x = 1,277.23