Finding the Fourth Proportional to 1,085.25, 1,627.94 and 315.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.25 : 1,627.94 = 315.81 : x
2. Step 2: Convert to fraction form
   1,085.25/1,627.94 = 315.81/x
3. Step 3: Cross multiply
   1,085.25x = 1,627.94 × 315.81
4. Step 4: Simplify right side
   1,085.25x = 514,119.73
5. Step 5: Solve for x
   x = 514,119.73/1,085.25
6. Step 6: Final answer
   x = 473.73