Finding the Third Proportional to 50,640 and 74,128

Step by Step Solution

1. Step 1: Write the proportion equation
   50,640 : 74,128 = 74,128 : x
2. Step 2: Convert to fraction form
   50,640/74,128 = 74,128/x
3. Step 3: Cross multiply
   50,640x = 74,128 × 74,128
4. Step 4: Simplify right side
   50,640x = 5,494,960,384
5. Step 5: Solve for x
   x = 5,494,960,384/50,640
6. Step 6: Final answer
   x = 108,510.28