Finding the Third Proportional to 139,992 and 210,708

Step by Step Solution

1. Step 1: Write the proportion equation
   139,992 : 210,708 = 210,708 : x
2. Step 2: Convert to fraction form
   139,992/210,708 = 210,708/x
3. Step 3: Cross multiply
   139,992x = 210,708 × 210,708
4. Step 4: Simplify right side
   139,992x = 44,397,861,264
5. Step 5: Solve for x
   x = 44,397,861,264/139,992
6. Step 6: Final answer
   x = 317,145.70