Finding the Fourth Proportional to 1,013.52, 1,519.71 and 320.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,013.52 : 1,519.71 = 320.06 : x
2. Step 2: Convert to fraction form
   1,013.52/1,519.71 = 320.06/x
3. Step 3: Cross multiply
   1,013.52x = 1,519.71 × 320.06
4. Step 4: Simplify right side
   1,013.52x = 486,398.38
5. Step 5: Solve for x
   x = 486,398.38/1,013.52
6. Step 6: Final answer
   x = 479.91