Finding the Third Proportional to 80,485.50 and 128,116

Step by Step Solution

1. Step 1: Write the proportion equation
   80,485.50 : 128,116 = 128,116 : x
2. Step 2: Convert to fraction form
   80,485.50/128,116 = 128,116/x
3. Step 3: Cross multiply
   80,485.50x = 128,116 × 128,116
4. Step 4: Simplify right side
   80,485.50x = 16,413,709,456
5. Step 5: Solve for x
   x = 16,413,709,456/80,485.50
6. Step 6: Final answer
   x = 203,933.75