Finding the Fourth Proportional to 2,020.31, 3,031.32 and 850.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,020.31 : 3,031.32 = 850.61 : x
2. Step 2: Convert to fraction form
   2,020.31/3,031.32 = 850.61/x
3. Step 3: Cross multiply
   2,020.31x = 3,031.32 × 850.61
4. Step 4: Simplify right side
   2,020.31x = 2,578,471.11
5. Step 5: Solve for x
   x = 2,578,471.11/2,020.31
6. Step 6: Final answer
   x = 1,276.27