Finding the Third Proportional to 72,311 and 108,039

Step by Step Solution

1. Step 1: Write the proportion equation
   72,311 : 108,039 = 108,039 : x
2. Step 2: Convert to fraction form
   72,311/108,039 = 108,039/x
3. Step 3: Cross multiply
   72,311x = 108,039 × 108,039
4. Step 4: Simplify right side
   72,311x = 11,672,425,521
5. Step 5: Solve for x
   x = 11,672,425,521/72,311
6. Step 6: Final answer
   x = 161,419.78