Finding the Fourth Proportional to 1,072.27, 1,605.48 and 681.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.27 : 1,605.48 = 681.31 : x
2. Step 2: Convert to fraction form
   1,072.27/1,605.48 = 681.31/x
3. Step 3: Cross multiply
   1,072.27x = 1,605.48 × 681.31
4. Step 4: Simplify right side
   1,072.27x = 1,093,829.58
5. Step 5: Solve for x
   x = 1,093,829.58/1,072.27
6. Step 6: Final answer
   x = 1,020.11