Finding the Fourth Proportional to 1,022.21, 1,532.72 and 328.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,022.21 : 1,532.72 = 328.71 : x
2. Step 2: Convert to fraction form
   1,022.21/1,532.72 = 328.71/x
3. Step 3: Cross multiply
   1,022.21x = 1,532.72 × 328.71
4. Step 4: Simplify right side
   1,022.21x = 503,818.75
5. Step 5: Solve for x
   x = 503,818.75/1,022.21
6. Step 6: Final answer
   x = 492.87