Finding the Fourth Proportional to 1,145.55, 1,718.61 and 323.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.55 : 1,718.61 = 323.82 : x
2. Step 2: Convert to fraction form
   1,145.55/1,718.61 = 323.82/x
3. Step 3: Cross multiply
   1,145.55x = 1,718.61 × 323.82
4. Step 4: Simplify right side
   1,145.55x = 556,520.29
5. Step 5: Solve for x
   x = 556,520.29/1,145.55
6. Step 6: Final answer
   x = 485.81