Finding the Third Proportional to 81,720 and 173,520

Step by Step Solution

1. Step 1: Write the proportion equation
   81,720 : 173,520 = 173,520 : x
2. Step 2: Convert to fraction form
   81,720/173,520 = 173,520/x
3. Step 3: Cross multiply
   81,720x = 173,520 × 173,520
4. Step 4: Simplify right side
   81,720x = 30,109,190,400
5. Step 5: Solve for x
   x = 30,109,190,400/81,720
6. Step 6: Final answer
   x = 368,443.35