Finding the Fourth Proportional to 1,169.31, 1,754.18 and 439.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,169.31 : 1,754.18 = 439.10 : x
2. Step 2: Convert to fraction form
   1,169.31/1,754.18 = 439.10/x
3. Step 3: Cross multiply
   1,169.31x = 1,754.18 × 439.10
4. Step 4: Simplify right side
   1,169.31x = 770,249.47
5. Step 5: Solve for x
   x = 770,249.47/1,169.31
6. Step 6: Final answer
   x = 658.72