Finding the Fourth Proportional to 1,086.30, 1,629.57 and 559.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.30 : 1,629.57 = 559.42 : x
2. Step 2: Convert to fraction form
   1,086.30/1,629.57 = 559.42/x
3. Step 3: Cross multiply
   1,086.30x = 1,629.57 × 559.42
4. Step 4: Simplify right side
   1,086.30x = 911,614.05
5. Step 5: Solve for x
   x = 911,614.05/1,086.30
6. Step 6: Final answer
   x = 839.19