Finding the Third Proportional to 143,869 and 215,805

Step by Step Solution

1. Step 1: Write the proportion equation
   143,869 : 215,805 = 215,805 : x
2. Step 2: Convert to fraction form
   143,869/215,805 = 215,805/x
3. Step 3: Cross multiply
   143,869x = 215,805 × 215,805
4. Step 4: Simplify right side
   143,869x = 46,571,798,025
5. Step 5: Solve for x
   x = 46,571,798,025/143,869
6. Step 6: Final answer
   x = 323,709.75