Finding the Fourth Proportional to 2,072.98, 3,109.17 and 687.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.98 : 3,109.17 = 687.27 : x
2. Step 2: Convert to fraction form
   2,072.98/3,109.17 = 687.27/x
3. Step 3: Cross multiply
   2,072.98x = 3,109.17 × 687.27
4. Step 4: Simplify right side
   2,072.98x = 2,136,839.27
5. Step 5: Solve for x
   x = 2,136,839.27/2,072.98
6. Step 6: Final answer
   x = 1,030.81