Finding the Third Proportional to 31,040 and 65,760

Step by Step Solution

1. Step 1: Write the proportion equation
   31,040 : 65,760 = 65,760 : x
2. Step 2: Convert to fraction form
   31,040/65,760 = 65,760/x
3. Step 3: Cross multiply
   31,040x = 65,760 × 65,760
4. Step 4: Simplify right side
   31,040x = 4,324,377,600
5. Step 5: Solve for x
   x = 4,324,377,600/31,040
6. Step 6: Final answer
   x = 139,316.29