Finding the Fourth Proportional to 1,085.92, 1,629.16 and 316.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.92 : 1,629.16 = 316.42 : x
2. Step 2: Convert to fraction form
   1,085.92/1,629.16 = 316.42/x
3. Step 3: Cross multiply
   1,085.92x = 1,629.16 × 316.42
4. Step 4: Simplify right side
   1,085.92x = 515,498.81
5. Step 5: Solve for x
   x = 515,498.81/1,085.92
6. Step 6: Final answer
   x = 474.71