Finding the Fourth Proportional to 2,086.52, 3,128.62 and 854.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.52 : 3,128.62 = 854.79 : x
2. Step 2: Convert to fraction form
   2,086.52/3,128.62 = 854.79/x
3. Step 3: Cross multiply
   2,086.52x = 3,128.62 × 854.79
4. Step 4: Simplify right side
   2,086.52x = 2,674,313.09
5. Step 5: Solve for x
   x = 2,674,313.09/2,086.52
6. Step 6: Final answer
   x = 1,281.71