Finding the Third Proportional to 139,869 and 215,112

Step by Step Solution

1. Step 1: Write the proportion equation
   139,869 : 215,112 = 215,112 : x
2. Step 2: Convert to fraction form
   139,869/215,112 = 215,112/x
3. Step 3: Cross multiply
   139,869x = 215,112 × 215,112
4. Step 4: Simplify right side
   139,869x = 46,273,172,544
5. Step 5: Solve for x
   x = 46,273,172,544/139,869
6. Step 6: Final answer
   x = 330,832.23