Finding the Third Proportional to 143,542 and 309,019

Step by Step Solution

1. Step 1: Write the proportion equation
   143,542 : 309,019 = 309,019 : x
2. Step 2: Convert to fraction form
   143,542/309,019 = 309,019/x
3. Step 3: Cross multiply
   143,542x = 309,019 × 309,019
4. Step 4: Simplify right side
   143,542x = 95,492,742,361
5. Step 5: Solve for x
   x = 95,492,742,361/143,542
6. Step 6: Final answer
   x = 665,259.94