Finding the Third Proportional to 42,800 and 65,870

Step by Step Solution

1. Step 1: Write the proportion equation
   42,800 : 65,870 = 65,870 : x
2. Step 2: Convert to fraction form
   42,800/65,870 = 65,870/x
3. Step 3: Cross multiply
   42,800x = 65,870 × 65,870
4. Step 4: Simplify right side
   42,800x = 4,338,856,900
5. Step 5: Solve for x
   x = 4,338,856,900/42,800
6. Step 6: Final answer
   x = 101,375.16