Finding the Third Proportional to 42,180 and 64,728

Step by Step Solution

1. Step 1: Write the proportion equation
   42,180 : 64,728 = 64,728 : x
2. Step 2: Convert to fraction form
   42,180/64,728 = 64,728/x
3. Step 3: Cross multiply
   42,180x = 64,728 × 64,728
4. Step 4: Simplify right side
   42,180x = 4,189,713,984
5. Step 5: Solve for x
   x = 4,189,713,984/42,180
6. Step 6: Final answer
   x = 99,329.40