Finding the Third Proportional to 139,968 and 216,864

Step by Step Solution

1. Step 1: Write the proportion equation
   139,968 : 216,864 = 216,864 : x
2. Step 2: Convert to fraction form
   139,968/216,864 = 216,864/x
3. Step 3: Cross multiply
   139,968x = 216,864 × 216,864
4. Step 4: Simplify right side
   139,968x = 47,029,994,496
5. Step 5: Solve for x
   x = 47,029,994,496/139,968
6. Step 6: Final answer
   x = 336,005.33