Finding the Fourth Proportional to 1,015.74, 1,401.27 and 717.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.74 : 1,401.27 = 717.42 : x
2. Step 2: Convert to fraction form
   1,015.74/1,401.27 = 717.42/x
3. Step 3: Cross multiply
   1,015.74x = 1,401.27 × 717.42
4. Step 4: Simplify right side
   1,015.74x = 1,005,301.69
5. Step 5: Solve for x
   x = 1,005,301.69/1,015.74
6. Step 6: Final answer
   x = 989.72