Finding the Fourth Proportional to 1,085.69, 1,627.92 and 355.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.69 : 1,627.92 = 355.07 : x
2. Step 2: Convert to fraction form
   1,085.69/1,627.92 = 355.07/x
3. Step 3: Cross multiply
   1,085.69x = 1,627.92 × 355.07
4. Step 4: Simplify right side
   1,085.69x = 578,017.41
5. Step 5: Solve for x
   x = 578,017.41/1,085.69
6. Step 6: Final answer
   x = 532.40