Finding the Fourth Proportional to 1,085.74, 1,628.56 and 355.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.74 : 1,628.56 = 355.23 : x
2. Step 2: Convert to fraction form
   1,085.74/1,628.56 = 355.23/x
3. Step 3: Cross multiply
   1,085.74x = 1,628.56 × 355.23
4. Step 4: Simplify right side
   1,085.74x = 578,513.37
5. Step 5: Solve for x
   x = 578,513.37/1,085.74
6. Step 6: Final answer
   x = 532.83