Finding the Third Proportional to 85,155 and 128,910

Step by Step Solution

1. Step 1: Write the proportion equation
   85,155 : 128,910 = 128,910 : x
2. Step 2: Convert to fraction form
   85,155/128,910 = 128,910/x
3. Step 3: Cross multiply
   85,155x = 128,910 × 128,910
4. Step 4: Simplify right side
   85,155x = 16,617,788,100
5. Step 5: Solve for x
   x = 16,617,788,100/85,155
6. Step 6: Final answer
   x = 195,147.53