Finding the Third Proportional to 64,512.28 and 89,144.30

Step by Step Solution

1. Step 1: Write the proportion equation
   64,512.28 : 89,144.30 = 89,144.30 : x
2. Step 2: Convert to fraction form
   64,512.28/89,144.30 = 89,144.30/x
3. Step 3: Cross multiply
   64,512.28x = 89,144.30 × 89,144.30
4. Step 4: Simplify right side
   64,512.28x = 7,946,705,665.34
5. Step 5: Solve for x
   x = 7,946,705,665.34/64,512.28
6. Step 6: Final answer
   x = 123,181.28