Finding the Third Proportional to 67,439.25 and 144,720

Step by Step Solution

1. Step 1: Write the proportion equation
   67,439.25 : 144,720 = 144,720 : x
2. Step 2: Convert to fraction form
   67,439.25/144,720 = 144,720/x
3. Step 3: Cross multiply
   67,439.25x = 144,720 × 144,720
4. Step 4: Simplify right side
   67,439.25x = 20,943,878,400
5. Step 5: Solve for x
   x = 20,943,878,400/67,439.25
6. Step 6: Final answer
   x = 310,559.18