Finding the Third Proportional to 57,128 and 123,792

Step by Step Solution

1. Step 1: Write the proportion equation
   57,128 : 123,792 = 123,792 : x
2. Step 2: Convert to fraction form
   57,128/123,792 = 123,792/x
3. Step 3: Cross multiply
   57,128x = 123,792 × 123,792
4. Step 4: Simplify right side
   57,128x = 15,324,459,264
5. Step 5: Solve for x
   x = 15,324,459,264/57,128
6. Step 6: Final answer
   x = 268,247.78