Finding the Third Proportional to 72,018 and 109,021.50

Step by Step Solution

1. Step 1: Write the proportion equation
   72,018 : 109,021.50 = 109,021.50 : x
2. Step 2: Convert to fraction form
   72,018/109,021.50 = 109,021.50/x
3. Step 3: Cross multiply
   72,018x = 109,021.50 × 109,021.50
4. Step 4: Simplify right side
   72,018x = 11,885,687,462.25
5. Step 5: Solve for x
   x = 11,885,687,462.25/72,018
6. Step 6: Final answer
   x = 165,037.73