Finding the Fourth Proportional to 1,086.55, 1,629.49 and 355.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.55 : 1,629.49 = 355.96 : x
2. Step 2: Convert to fraction form
   1,086.55/1,629.49 = 355.96/x
3. Step 3: Cross multiply
   1,086.55x = 1,629.49 × 355.96
4. Step 4: Simplify right side
   1,086.55x = 580,026.95
5. Step 5: Solve for x
   x = 580,026.95/1,086.55
6. Step 6: Final answer
   x = 533.82