Finding the Third Proportional to 939 and 1,040.25

Step by Step Solution

1. Step 1: Write the proportion equation
   939 : 1,040.25 = 1,040.25 : x
2. Step 2: Convert to fraction form
   939/1,040.25 = 1,040.25/x
3. Step 3: Cross multiply
   939x = 1,040.25 × 1,040.25
4. Step 4: Simplify right side
   939x = 1,082,120.06
5. Step 5: Solve for x
   x = 1,082,120.06/939
6. Step 6: Final answer
   x = 1,152.42