Finding the Third Proportional to 50,860 and 78,686

Step by Step Solution

1. Step 1: Write the proportion equation
   50,860 : 78,686 = 78,686 : x
2. Step 2: Convert to fraction form
   50,860/78,686 = 78,686/x
3. Step 3: Cross multiply
   50,860x = 78,686 × 78,686
4. Step 4: Simplify right side
   50,860x = 6,191,486,596
5. Step 5: Solve for x
   x = 6,191,486,596/50,860
6. Step 6: Final answer
   x = 121,735.87