Finding the Third Proportional to 50,720 and 78,000

Step by Step Solution

1. Step 1: Write the proportion equation
   50,720 : 78,000 = 78,000 : x
2. Step 2: Convert to fraction form
   50,720/78,000 = 78,000/x
3. Step 3: Cross multiply
   50,720x = 78,000 × 78,000
4. Step 4: Simplify right side
   50,720x = 6,084,000,000
5. Step 5: Solve for x
   x = 6,084,000,000/50,720
6. Step 6: Final answer
   x = 119,952.68