Finding the Fourth Proportional to 1,003.39, 1,505.24 and 309.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.39 : 1,505.24 = 309.89 : x
2. Step 2: Convert to fraction form
   1,003.39/1,505.24 = 309.89/x
3. Step 3: Cross multiply
   1,003.39x = 1,505.24 × 309.89
4. Step 4: Simplify right side
   1,003.39x = 466,463.94
5. Step 5: Solve for x
   x = 466,463.94/1,003.39
6. Step 6: Final answer
   x = 464.89