Finding the Fourth Proportional to 1,143.98, 1,715.71 and 681.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,143.98 : 1,715.71 = 681.89 : x
2. Step 2: Convert to fraction form
   1,143.98/1,715.71 = 681.89/x
3. Step 3: Cross multiply
   1,143.98x = 1,715.71 × 681.89
4. Step 4: Simplify right side
   1,143.98x = 1,169,925.49
5. Step 5: Solve for x
   x = 1,169,925.49/1,143.98
6. Step 6: Final answer
   x = 1,022.68