Finding the Fourth Proportional to 1,086.82, 1,630.23 and 317.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.82 : 1,630.23 = 317.86 : x
2. Step 2: Convert to fraction form
   1,086.82/1,630.23 = 317.86/x
3. Step 3: Cross multiply
   1,086.82x = 1,630.23 × 317.86
4. Step 4: Simplify right side
   1,086.82x = 518,184.91
5. Step 5: Solve for x
   x = 518,184.91/1,086.82
6. Step 6: Final answer
   x = 476.79