Finding the Fourth Proportional to 1,085.91, 1,629.06 and 355.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.91 : 1,629.06 = 355.34 : x
2. Step 2: Convert to fraction form
   1,085.91/1,629.06 = 355.34/x
3. Step 3: Cross multiply
   1,085.91x = 1,629.06 × 355.34
4. Step 4: Simplify right side
   1,085.91x = 578,865.76
5. Step 5: Solve for x
   x = 578,865.76/1,085.91
6. Step 6: Final answer
   x = 533.07