Finding the Third Proportional to 85,105.69 and 128,025.88

Step by Step Solution

1. Step 1: Write the proportion equation
   85,105.69 : 128,025.88 = 128,025.88 : x
2. Step 2: Convert to fraction form
   85,105.69/128,025.88 = 128,025.88/x
3. Step 3: Cross multiply
   85,105.69x = 128,025.88 × 128,025.88
4. Step 4: Simplify right side
   85,105.69x = 16,390,625,669.72
5. Step 5: Solve for x
   x = 16,390,625,669.72/85,105.69
6. Step 6: Final answer
   x = 192,591.43