Finding the Fourth Proportional to 1,086.39, 1,629.58 and 871.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.39 : 1,629.58 = 871.33 : x
2. Step 2: Convert to fraction form
   1,086.39/1,629.58 = 871.33/x
3. Step 3: Cross multiply
   1,086.39x = 1,629.58 × 871.33
4. Step 4: Simplify right side
   1,086.39x = 1,419,901.94
5. Step 5: Solve for x
   x = 1,419,901.94/1,086.39
6. Step 6: Final answer
   x = 1,306.99