Finding the Third Proportional to 69.89 and 144.28

Step by Step Solution

1. Step 1: Write the proportion equation
   69.89 : 144.28 = 144.28 : x
2. Step 2: Convert to fraction form
   69.89/144.28 = 144.28/x
3. Step 3: Cross multiply
   69.89x = 144.28 × 144.28
4. Step 4: Simplify right side
   69.89x = 20,817.08
5. Step 5: Solve for x
   x = 20,817.08/69.89
6. Step 6: Final answer
   x = 297.85