Finding the Fourth Proportional to 1,039.98, 1,559.96 and 309.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.98 : 1,559.96 = 309.54 : x
2. Step 2: Convert to fraction form
   1,039.98/1,559.96 = 309.54/x
3. Step 3: Cross multiply
   1,039.98x = 1,559.96 × 309.54
4. Step 4: Simplify right side
   1,039.98x = 482,870.02
5. Step 5: Solve for x
   x = 482,870.02/1,039.98
6. Step 6: Final answer
   x = 464.31