Finding the Third Proportional to 89,743.78 and 138,942.42

Step by Step Solution

1. Step 1: Write the proportion equation
   89,743.78 : 138,942.42 = 138,942.42 : x
2. Step 2: Convert to fraction form
   89,743.78/138,942.42 = 138,942.42/x
3. Step 3: Cross multiply
   89,743.78x = 138,942.42 × 138,942.42
4. Step 4: Simplify right side
   89,743.78x = 19,304,996,596.49
5. Step 5: Solve for x
   x = 19,304,996,596.49/89,743.78
6. Step 6: Final answer
   x = 215,112.36