Finding the Fourth Proportional to 1,039.92, 1,559.37 and 309.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.92 : 1,559.37 = 309.42 : x
2. Step 2: Convert to fraction form
   1,039.92/1,559.37 = 309.42/x
3. Step 3: Cross multiply
   1,039.92x = 1,559.37 × 309.42
4. Step 4: Simplify right side
   1,039.92x = 482,500.27
5. Step 5: Solve for x
   x = 482,500.27/1,039.92
6. Step 6: Final answer
   x = 463.98