Finding the Third Proportional to 139,392 and 216,144

Step by Step Solution

1. Step 1: Write the proportion equation
   139,392 : 216,144 = 216,144 : x
2. Step 2: Convert to fraction form
   139,392/216,144 = 216,144/x
3. Step 3: Cross multiply
   139,392x = 216,144 × 216,144
4. Step 4: Simplify right side
   139,392x = 46,718,228,736
5. Step 5: Solve for x
   x = 46,718,228,736/139,392
6. Step 6: Final answer
   x = 335,157.17