Finding the Third Proportional to 80,641.50 and 128,112.50

Step by Step Solution

1. Step 1: Write the proportion equation
   80,641.50 : 128,112.50 = 128,112.50 : x
2. Step 2: Convert to fraction form
   80,641.50/128,112.50 = 128,112.50/x
3. Step 3: Cross multiply
   80,641.50x = 128,112.50 × 128,112.50
4. Step 4: Simplify right side
   80,641.50x = 16,412,812,656.25
5. Step 5: Solve for x
   x = 16,412,812,656.25/80,641.50
6. Step 6: Final answer
   x = 203,528.12