Finding the Fourth Proportional to 1,053.76, 1,580.72 and 323.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,053.76 : 1,580.72 = 323.34 : x
2. Step 2: Convert to fraction form
   1,053.76/1,580.72 = 323.34/x
3. Step 3: Cross multiply
   1,053.76x = 1,580.72 × 323.34
4. Step 4: Simplify right side
   1,053.76x = 511,110.00
5. Step 5: Solve for x
   x = 511,110.00/1,053.76
6. Step 6: Final answer
   x = 485.03