Finding the Fourth Proportional to 1,039.69, 1,559.54 and 309.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.69 : 1,559.54 = 309.34 : x
2. Step 2: Convert to fraction form
   1,039.69/1,559.54 = 309.34/x
3. Step 3: Cross multiply
   1,039.69x = 1,559.54 × 309.34
4. Step 4: Simplify right side
   1,039.69x = 482,428.10
5. Step 5: Solve for x
   x = 482,428.10/1,039.69
6. Step 6: Final answer
   x = 464.01