Finding the Fourth Proportional to 1,086.69, 1,629.42 and 356.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.69 : 1,629.42 = 356.07 : x
2. Step 2: Convert to fraction form
   1,086.69/1,629.42 = 356.07/x
3. Step 3: Cross multiply
   1,086.69x = 1,629.42 × 356.07
4. Step 4: Simplify right side
   1,086.69x = 580,187.58
5. Step 5: Solve for x
   x = 580,187.58/1,086.69
6. Step 6: Final answer
   x = 533.90