Finding the Third Proportional to 50,862 and 78,689

Step by Step Solution

1. Step 1: Write the proportion equation
   50,862 : 78,689 = 78,689 : x
2. Step 2: Convert to fraction form
   50,862/78,689 = 78,689/x
3. Step 3: Cross multiply
   50,862x = 78,689 × 78,689
4. Step 4: Simplify right side
   50,862x = 6,191,958,721
5. Step 5: Solve for x
   x = 6,191,958,721/50,862
6. Step 6: Final answer
   x = 121,740.37