Finding the Third Proportional to 81,958.50 and 128,648.25

Step by Step Solution

1. Step 1: Write the proportion equation
   81,958.50 : 128,648.25 = 128,648.25 : x
2. Step 2: Convert to fraction form
   81,958.50/128,648.25 = 128,648.25/x
3. Step 3: Cross multiply
   81,958.50x = 128,648.25 × 128,648.25
4. Step 4: Simplify right side
   81,958.50x = 16,550,372,228.06
5. Step 5: Solve for x
   x = 16,550,372,228.06/81,958.50
6. Step 6: Final answer
   x = 201,936.01