Finding the Fourth Proportional to 1,054.35, 1,581.59 and 323.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,054.35 : 1,581.59 = 323.87 : x
2. Step 2: Convert to fraction form
   1,054.35/1,581.59 = 323.87/x
3. Step 3: Cross multiply
   1,054.35x = 1,581.59 × 323.87
4. Step 4: Simplify right side
   1,054.35x = 512,222.46
5. Step 5: Solve for x
   x = 512,222.46/1,054.35
6. Step 6: Final answer
   x = 485.82