Finding the Third Proportional to 57,728 and 86,360

Step by Step Solution

1. Step 1: Write the proportion equation
   57,728 : 86,360 = 86,360 : x
2. Step 2: Convert to fraction form
   57,728/86,360 = 86,360/x
3. Step 3: Cross multiply
   57,728x = 86,360 × 86,360
4. Step 4: Simplify right side
   57,728x = 7,458,049,600
5. Step 5: Solve for x
   x = 7,458,049,600/57,728
6. Step 6: Final answer
   x = 129,192.93