Finding the Fourth Proportional to 1,085.94, 1,629.15 and 316.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.94 : 1,629.15 = 316.50 : x
2. Step 2: Convert to fraction form
   1,085.94/1,629.15 = 316.50/x
3. Step 3: Cross multiply
   1,085.94x = 1,629.15 × 316.50
4. Step 4: Simplify right side
   1,085.94x = 515,625.98
5. Step 5: Solve for x
   x = 515,625.98/1,085.94
6. Step 6: Final answer
   x = 474.82