Finding the Fourth Proportional to 2,586.04, 3,879.78 and 854.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,586.04 : 3,879.78 = 854.71 : x
2. Step 2: Convert to fraction form
   2,586.04/3,879.78 = 854.71/x
3. Step 3: Cross multiply
   2,586.04x = 3,879.78 × 854.71
4. Step 4: Simplify right side
   2,586.04x = 3,316,086.76
5. Step 5: Solve for x
   x = 3,316,086.76/2,586.04
6. Step 6: Final answer
   x = 1,282.30