Finding the Fourth Proportional to 3,859.55, 5,789.37 and 1,086.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,859.55 : 5,789.37 = 1,086.31 : x
2. Step 2: Convert to fraction form
   3,859.55/5,789.37 = 1,086.31/x
3. Step 3: Cross multiply
   3,859.55x = 5,789.37 × 1,086.31
4. Step 4: Simplify right side
   3,859.55x = 6,289,061.84
5. Step 5: Solve for x
   x = 6,289,061.84/3,859.55
6. Step 6: Final answer
   x = 1,629.48