Finding the Third Proportional to 83,159.50 and 128,020

Step by Step Solution

1. Step 1: Write the proportion equation
   83,159.50 : 128,020 = 128,020 : x
2. Step 2: Convert to fraction form
   83,159.50/128,020 = 128,020/x
3. Step 3: Cross multiply
   83,159.50x = 128,020 × 128,020
4. Step 4: Simplify right side
   83,159.50x = 16,389,120,400
5. Step 5: Solve for x
   x = 16,389,120,400/83,159.50
6. Step 6: Final answer
   x = 197,080.55