Finding the Third Proportional to 143,571 and 309,078

Step by Step Solution

1. Step 1: Write the proportion equation
   143,571 : 309,078 = 309,078 : x
2. Step 2: Convert to fraction form
   143,571/309,078 = 309,078/x
3. Step 3: Cross multiply
   143,571x = 309,078 × 309,078
4. Step 4: Simplify right side
   143,571x = 95,529,210,084
5. Step 5: Solve for x
   x = 95,529,210,084/143,571
6. Step 6: Final answer
   x = 665,379.57