Finding the Fourth Proportional to 1,031.09, 1,423.55 and 716.26

Step by Step Solution

1. Step 1: Write the proportion equation
   1,031.09 : 1,423.55 = 716.26 : x
2. Step 2: Convert to fraction form
   1,031.09/1,423.55 = 716.26/x
3. Step 3: Cross multiply
   1,031.09x = 1,423.55 × 716.26
4. Step 4: Simplify right side
   1,031.09x = 1,019,621.22
5. Step 5: Solve for x
   x = 1,019,621.22/1,031.09
6. Step 6: Final answer
   x = 988.88