Finding the Fourth Proportional to 1,283.25, 1,763.18 and 1,020.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,283.25 : 1,763.18 = 1,020.81 : x
2. Step 2: Convert to fraction form
   1,283.25/1,763.18 = 1,020.81/x
3. Step 3: Cross multiply
   1,283.25x = 1,763.18 × 1,020.81
4. Step 4: Simplify right side
   1,283.25x = 1,799,871.78
5. Step 5: Solve for x
   x = 1,799,871.78/1,283.25
6. Step 6: Final answer
   x = 1,402.59