Finding the Fourth Proportional to 2,020.50, 3,031.08 and 721.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,020.50 : 3,031.08 = 721.89 : x
2. Step 2: Convert to fraction form
   2,020.50/3,031.08 = 721.89/x
3. Step 3: Cross multiply
   2,020.50x = 3,031.08 × 721.89
4. Step 4: Simplify right side
   2,020.50x = 2,188,106.34
5. Step 5: Solve for x
   x = 2,188,106.34/2,020.50
6. Step 6: Final answer
   x = 1,082.95