Finding the Third Proportional to 88,128 and 188,720

Step by Step Solution

1. Step 1: Write the proportion equation
   88,128 : 188,720 = 188,720 : x
2. Step 2: Convert to fraction form
   88,128/188,720 = 188,720/x
3. Step 3: Cross multiply
   88,128x = 188,720 × 188,720
4. Step 4: Simplify right side
   88,128x = 35,615,238,400
5. Step 5: Solve for x
   x = 35,615,238,400/88,128
6. Step 6: Final answer
   x = 404,130.79