Finding the Fourth Proportional to 2,020.48, 3,030.96 and 721.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,020.48 : 3,030.96 = 721.72 : x
2. Step 2: Convert to fraction form
   2,020.48/3,030.96 = 721.72/x
3. Step 3: Cross multiply
   2,020.48x = 3,030.96 × 721.72
4. Step 4: Simplify right side
   2,020.48x = 2,187,504.45
5. Step 5: Solve for x
   x = 2,187,504.45/2,020.48
6. Step 6: Final answer
   x = 1,082.67