Finding the Fourth Proportional to 1,031.65, 1,424.33 and 716.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,031.65 : 1,424.33 = 716.82 : x
2. Step 2: Convert to fraction form
   1,031.65/1,424.33 = 716.82/x
3. Step 3: Cross multiply
   1,031.65x = 1,424.33 × 716.82
4. Step 4: Simplify right side
   1,031.65x = 1,020,979.32
5. Step 5: Solve for x
   x = 1,020,979.32/1,031.65
6. Step 6: Final answer
   x = 989.65