Finding the Fourth Proportional to 1,086.24, 1,629.52 and 355.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.24 : 1,629.52 = 355.58 : x
2. Step 2: Convert to fraction form
   1,086.24/1,629.52 = 355.58/x
3. Step 3: Cross multiply
   1,086.24x = 1,629.52 × 355.58
4. Step 4: Simplify right side
   1,086.24x = 579,424.72
5. Step 5: Solve for x
   x = 579,424.72/1,086.24
6. Step 6: Final answer
   x = 533.42