Finding the Fourth Proportional to 1,086.18, 1,629.33 and 355.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.18 : 1,629.33 = 355.98 : x
2. Step 2: Convert to fraction form
   1,086.18/1,629.33 = 355.98/x
3. Step 3: Cross multiply
   1,086.18x = 1,629.33 × 355.98
4. Step 4: Simplify right side
   1,086.18x = 580,008.89
5. Step 5: Solve for x
   x = 580,008.89/1,086.18
6. Step 6: Final answer
   x = 533.99