Finding the Fourth Proportional to 1,073.30, 1,480.81 and 631.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,073.30 : 1,480.81 = 631.31 : x
2. Step 2: Convert to fraction form
   1,073.30/1,480.81 = 631.31/x
3. Step 3: Cross multiply
   1,073.30x = 1,480.81 × 631.31
4. Step 4: Simplify right side
   1,073.30x = 934,850.16
5. Step 5: Solve for x
   x = 934,850.16/1,073.30
6. Step 6: Final answer
   x = 871.01