Finding the Third Proportional to 709.50 and 1,039.38

Step by Step Solution

1. Step 1: Write the proportion equation
   709.50 : 1,039.38 = 1,039.38 : x
2. Step 2: Convert to fraction form
   709.50/1,039.38 = 1,039.38/x
3. Step 3: Cross multiply
   709.50x = 1,039.38 × 1,039.38
4. Step 4: Simplify right side
   709.50x = 1,080,300.39
5. Step 5: Solve for x
   x = 1,080,300.39/709.50
6. Step 6: Final answer
   x = 1,522.62