Finding the Fourth Proportional to 1,016.20, 1,523.91 and 322.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.20 : 1,523.91 = 322.72 : x
2. Step 2: Convert to fraction form
   1,016.20/1,523.91 = 322.72/x
3. Step 3: Cross multiply
   1,016.20x = 1,523.91 × 322.72
4. Step 4: Simplify right side
   1,016.20x = 491,796.24
5. Step 5: Solve for x
   x = 491,796.24/1,016.20
6. Step 6: Final answer
   x = 483.96