Finding the Third Proportional to 754.25 and 1,139.38

Step by Step Solution

1. Step 1: Write the proportion equation
   754.25 : 1,139.38 = 1,139.38 : x
2. Step 2: Convert to fraction form
   754.25/1,139.38 = 1,139.38/x
3. Step 3: Cross multiply
   754.25x = 1,139.38 × 1,139.38
4. Step 4: Simplify right side
   754.25x = 1,298,175.39
5. Step 5: Solve for x
   x = 1,298,175.39/754.25
6. Step 6: Final answer
   x = 1,721.15