Finding the Fourth Proportional to 1,074.05, 1,481.59 and 631.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,074.05 : 1,481.59 = 631.89 : x
2. Step 2: Convert to fraction form
   1,074.05/1,481.59 = 631.89/x
3. Step 3: Cross multiply
   1,074.05x = 1,481.59 × 631.89
4. Step 4: Simplify right side
   1,074.05x = 936,201.91
5. Step 5: Solve for x
   x = 936,201.91/1,074.05
6. Step 6: Final answer
   x = 871.66