Finding the Third Proportional to 85,150.50 and 128,905

Step by Step Solution

1. Step 1: Write the proportion equation
   85,150.50 : 128,905 = 128,905 : x
2. Step 2: Convert to fraction form
   85,150.50/128,905 = 128,905/x
3. Step 3: Cross multiply
   85,150.50x = 128,905 × 128,905
4. Step 4: Simplify right side
   85,150.50x = 16,616,499,025
5. Step 5: Solve for x
   x = 16,616,499,025/85,150.50
6. Step 6: Final answer
   x = 195,142.71