Finding the Third Proportional to 65,640 and 143,988

Step by Step Solution

1. Step 1: Write the proportion equation
   65,640 : 143,988 = 143,988 : x
2. Step 2: Convert to fraction form
   65,640/143,988 = 143,988/x
3. Step 3: Cross multiply
   65,640x = 143,988 × 143,988
4. Step 4: Simplify right side
   65,640x = 20,732,544,144
5. Step 5: Solve for x
   x = 20,732,544,144/65,640
6. Step 6: Final answer
   x = 315,852.29