Finding the Third Proportional to 139,404 and 210,834

Step by Step Solution

1. Step 1: Write the proportion equation
   139,404 : 210,834 = 210,834 : x
2. Step 2: Convert to fraction form
   139,404/210,834 = 210,834/x
3. Step 3: Cross multiply
   139,404x = 210,834 × 210,834
4. Step 4: Simplify right side
   139,404x = 44,450,975,556
5. Step 5: Solve for x
   x = 44,450,975,556/139,404
6. Step 6: Final answer
   x = 318,864.42