Finding the Fourth Proportional to 1,016.91, 1,523.61 and 687.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.91 : 1,523.61 = 687.12 : x
2. Step 2: Convert to fraction form
   1,016.91/1,523.61 = 687.12/x
3. Step 3: Cross multiply
   1,016.91x = 1,523.61 × 687.12
4. Step 4: Simplify right side
   1,016.91x = 1,046,902.90
5. Step 5: Solve for x
   x = 1,046,902.90/1,016.91
6. Step 6: Final answer
   x = 1,029.49