Finding the Third Proportional to 50,665 and 78,645

Step by Step Solution

1. Step 1: Write the proportion equation
   50,665 : 78,645 = 78,645 : x
2. Step 2: Convert to fraction form
   50,665/78,645 = 78,645/x
3. Step 3: Cross multiply
   50,665x = 78,645 × 78,645
4. Step 4: Simplify right side
   50,665x = 6,185,036,025
5. Step 5: Solve for x
   x = 6,185,036,025/50,665
6. Step 6: Final answer
   x = 122,077.10