Finding the Fourth Proportional to 1,085.58, 1,628.55 and 355.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.58 : 1,628.55 = 355.02 : x
2. Step 2: Convert to fraction form
   1,085.58/1,628.55 = 355.02/x
3. Step 3: Cross multiply
   1,085.58x = 1,628.55 × 355.02
4. Step 4: Simplify right side
   1,085.58x = 578,167.82
5. Step 5: Solve for x
   x = 578,167.82/1,085.58
6. Step 6: Final answer
   x = 532.59