Finding the Third Proportional to 139,968 and 215,136

Step by Step Solution

1. Step 1: Write the proportion equation
   139,968 : 215,136 = 215,136 : x
2. Step 2: Convert to fraction form
   139,968/215,136 = 215,136/x
3. Step 3: Cross multiply
   139,968x = 215,136 × 215,136
4. Step 4: Simplify right side
   139,968x = 46,283,498,496
5. Step 5: Solve for x
   x = 46,283,498,496/139,968
6. Step 6: Final answer
   x = 330,672