Finding the Third Proportional to 81,388 and 173,288

Step by Step Solution

1. Step 1: Write the proportion equation
   81,388 : 173,288 = 173,288 : x
2. Step 2: Convert to fraction form
   81,388/173,288 = 173,288/x
3. Step 3: Cross multiply
   81,388x = 173,288 × 173,288
4. Step 4: Simplify right side
   81,388x = 30,028,730,944
5. Step 5: Solve for x
   x = 30,028,730,944/81,388
6. Step 6: Final answer
   x = 368,957.72