Finding the Third Proportional to 139,867 and 210,961

Step by Step Solution

1. Step 1: Write the proportion equation
   139,867 : 210,961 = 210,961 : x
2. Step 2: Convert to fraction form
   139,867/210,961 = 210,961/x
3. Step 3: Cross multiply
   139,867x = 210,961 × 210,961
4. Step 4: Simplify right side
   139,867x = 44,504,543,521
5. Step 5: Solve for x
   x = 44,504,543,521/139,867
6. Step 6: Final answer
   x = 318,191.88