Finding the Fourth Proportional to 2,020.72, 3,031.12 and 866.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,020.72 : 3,031.12 = 866.48 : x
2. Step 2: Convert to fraction form
   2,020.72/3,031.12 = 866.48/x
3. Step 3: Cross multiply
   2,020.72x = 3,031.12 × 866.48
4. Step 4: Simplify right side
   2,020.72x = 2,626,404.86
5. Step 5: Solve for x
   x = 2,626,404.86/2,020.72
6. Step 6: Final answer
   x = 1,299.74