Finding the Third Proportional to 83,920.50 and 128,072

Step by Step Solution

1. Step 1: Write the proportion equation
   83,920.50 : 128,072 = 128,072 : x
2. Step 2: Convert to fraction form
   83,920.50/128,072 = 128,072/x
3. Step 3: Cross multiply
   83,920.50x = 128,072 × 128,072
4. Step 4: Simplify right side
   83,920.50x = 16,402,437,184
5. Step 5: Solve for x
   x = 16,402,437,184/83,920.50
6. Step 6: Final answer
   x = 195,452.09