Finding the Third Proportional to 143,544 and 309,020

Step by Step Solution

1. Step 1: Write the proportion equation
   143,544 : 309,020 = 309,020 : x
2. Step 2: Convert to fraction form
   143,544/309,020 = 309,020/x
3. Step 3: Cross multiply
   143,544x = 309,020 × 309,020
4. Step 4: Simplify right side
   143,544x = 95,493,360,400
5. Step 5: Solve for x
   x = 95,493,360,400/143,544
6. Step 6: Final answer
   x = 665,254.98