Finding the Third Proportional to 65,721 and 142,515

Step by Step Solution

1. Step 1: Write the proportion equation
   65,721 : 142,515 = 142,515 : x
2. Step 2: Convert to fraction form
   65,721/142,515 = 142,515/x
3. Step 3: Cross multiply
   65,721x = 142,515 × 142,515
4. Step 4: Simplify right side
   65,721x = 20,310,525,225
5. Step 5: Solve for x
   x = 20,310,525,225/65,721
6. Step 6: Final answer
   x = 309,041.63