Finding the Fourth Proportional to 1,086.51, 1,629.91 and 355.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.51 : 1,629.91 = 355.85 : x
2. Step 2: Convert to fraction form
   1,086.51/1,629.91 = 355.85/x
3. Step 3: Cross multiply
   1,086.51x = 1,629.91 × 355.85
4. Step 4: Simplify right side
   1,086.51x = 580,003.47
5. Step 5: Solve for x
   x = 580,003.47/1,086.51
6. Step 6: Final answer
   x = 533.82