Finding the Third Proportional to 120,128 and 179,760

Step by Step Solution

1. Step 1: Write the proportion equation
   120,128 : 179,760 = 179,760 : x
2. Step 2: Convert to fraction form
   120,128/179,760 = 179,760/x
3. Step 3: Cross multiply
   120,128x = 179,760 × 179,760
4. Step 4: Simplify right side
   120,128x = 32,313,657,600
5. Step 5: Solve for x
   x = 32,313,657,600/120,128
6. Step 6: Final answer
   x = 268,993.55