Finding the Fourth Proportional to 1,085.94, 1,628.37 and 355.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.94 : 1,628.37 = 355.43 : x
2. Step 2: Convert to fraction form
   1,085.94/1,628.37 = 355.43/x
3. Step 3: Cross multiply
   1,085.94x = 1,628.37 × 355.43
4. Step 4: Simplify right side
   1,085.94x = 578,771.55
5. Step 5: Solve for x
   x = 578,771.55/1,085.94
6. Step 6: Final answer
   x = 532.97