Finding the Third Proportional to 50,710 and 78,930

Step by Step Solution

1. Step 1: Write the proportion equation
   50,710 : 78,930 = 78,930 : x
2. Step 2: Convert to fraction form
   50,710/78,930 = 78,930/x
3. Step 3: Cross multiply
   50,710x = 78,930 × 78,930
4. Step 4: Simplify right side
   50,710x = 6,229,944,900
5. Step 5: Solve for x
   x = 6,229,944,900/50,710
6. Step 6: Final answer
   x = 122,854.37