Finding the Fourth Proportional to 1,046.32, 1,569.72 and 315.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,046.32 : 1,569.72 = 315.88 : x
2. Step 2: Convert to fraction form
   1,046.32/1,569.72 = 315.88/x
3. Step 3: Cross multiply
   1,046.32x = 1,569.72 × 315.88
4. Step 4: Simplify right side
   1,046.32x = 495,843.15
5. Step 5: Solve for x
   x = 495,843.15/1,046.32
6. Step 6: Final answer
   x = 473.89