Finding the Third Proportional to 70,128 and 98,640

Step by Step Solution

1. Step 1: Write the proportion equation
   70,128 : 98,640 = 98,640 : x
2. Step 2: Convert to fraction form
   70,128/98,640 = 98,640/x
3. Step 3: Cross multiply
   70,128x = 98,640 × 98,640
4. Step 4: Simplify right side
   70,128x = 9,729,849,600
5. Step 5: Solve for x
   x = 9,729,849,600/70,128
6. Step 6: Final answer
   x = 138,744.15