Finding the Fourth Proportional to 1,031.89, 1,424.42 and 717.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,031.89 : 1,424.42 = 717.61 : x
2. Step 2: Convert to fraction form
   1,031.89/1,424.42 = 717.61/x
3. Step 3: Cross multiply
   1,031.89x = 1,424.42 × 717.61
4. Step 4: Simplify right side
   1,031.89x = 1,022,172.71
5. Step 5: Solve for x
   x = 1,022,172.71/1,031.89
6. Step 6: Final answer
   x = 990.59