Finding the Fourth Proportional to 1,046.48, 1,443.72 and 631.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,046.48 : 1,443.72 = 631.76 : x
2. Step 2: Convert to fraction form
   1,046.48/1,443.72 = 631.76/x
3. Step 3: Cross multiply
   1,046.48x = 1,443.72 × 631.76
4. Step 4: Simplify right side
   1,046.48x = 912,084.55
5. Step 5: Solve for x
   x = 912,084.55/1,046.48
6. Step 6: Final answer
   x = 871.57