Finding the Fourth Proportional to 1,053.80, 1,580.59 and 323.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,053.80 : 1,580.59 = 323.31 : x
2. Step 2: Convert to fraction form
   1,053.80/1,580.59 = 323.31/x
3. Step 3: Cross multiply
   1,053.80x = 1,580.59 × 323.31
4. Step 4: Simplify right side
   1,053.80x = 511,020.55
5. Step 5: Solve for x
   x = 511,020.55/1,053.80
6. Step 6: Final answer
   x = 484.93