Finding the Third Proportional to 80,641 and 128,111.50

Step by Step Solution

1. Step 1: Write the proportion equation
   80,641 : 128,111.50 = 128,111.50 : x
2. Step 2: Convert to fraction form
   80,641/128,111.50 = 128,111.50/x
3. Step 3: Cross multiply
   80,641x = 128,111.50 × 128,111.50
4. Step 4: Simplify right side
   80,641x = 16,412,556,432.25
5. Step 5: Solve for x
   x = 16,412,556,432.25/80,641
6. Step 6: Final answer
   x = 203,526.20