Finding the Third Proportional to 72,810 and 109,728

Step by Step Solution

1. Step 1: Write the proportion equation
   72,810 : 109,728 = 109,728 : x
2. Step 2: Convert to fraction form
   72,810/109,728 = 109,728/x
3. Step 3: Cross multiply
   72,810x = 109,728 × 109,728
4. Step 4: Simplify right side
   72,810x = 12,040,233,984
5. Step 5: Solve for x
   x = 12,040,233,984/72,810
6. Step 6: Final answer
   x = 165,365.11