Finding the Fourth Proportional to 1,010.40, 1,513.98 and 681.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,010.40 : 1,513.98 = 681.27 : x
2. Step 2: Convert to fraction form
   1,010.40/1,513.98 = 681.27/x
3. Step 3: Cross multiply
   1,010.40x = 1,513.98 × 681.27
4. Step 4: Simplify right side
   1,010.40x = 1,031,429.15
5. Step 5: Solve for x
   x = 1,031,429.15/1,010.40
6. Step 6: Final answer
   x = 1,020.81