Finding the Third Proportional to 39,760 and 55,728

Step by Step Solution

1. Step 1: Write the proportion equation
   39,760 : 55,728 = 55,728 : x
2. Step 2: Convert to fraction form
   39,760/55,728 = 55,728/x
3. Step 3: Cross multiply
   39,760x = 55,728 × 55,728
4. Step 4: Simplify right side
   39,760x = 3,105,609,984
5. Step 5: Solve for x
   x = 3,105,609,984/39,760
6. Step 6: Final answer
   x = 78,108.90