Finding the Third Proportional to 83,158.50 and 128,019

Step by Step Solution

1. Step 1: Write the proportion equation
   83,158.50 : 128,019 = 128,019 : x
2. Step 2: Convert to fraction form
   83,158.50/128,019 = 128,019/x
3. Step 3: Cross multiply
   83,158.50x = 128,019 × 128,019
4. Step 4: Simplify right side
   83,158.50x = 16,388,864,361
5. Step 5: Solve for x
   x = 16,388,864,361/83,158.50
6. Step 6: Final answer
   x = 197,079.85