Finding the Third Proportional to 139,968 and 210,672

Step by Step Solution

1. Step 1: Write the proportion equation
   139,968 : 210,672 = 210,672 : x
2. Step 2: Convert to fraction form
   139,968/210,672 = 210,672/x
3. Step 3: Cross multiply
   139,968x = 210,672 × 210,672
4. Step 4: Simplify right side
   139,968x = 44,382,691,584
5. Step 5: Solve for x
   x = 44,382,691,584/139,968
6. Step 6: Final answer
   x = 317,091.70