Finding the Third Proportional to 139,460 and 210,500

Step by Step Solution

1. Step 1: Write the proportion equation
   139,460 : 210,500 = 210,500 : x
2. Step 2: Convert to fraction form
   139,460/210,500 = 210,500/x
3. Step 3: Cross multiply
   139,460x = 210,500 × 210,500
4. Step 4: Simplify right side
   139,460x = 44,310,250,000
5. Step 5: Solve for x
   x = 44,310,250,000/139,460
6. Step 6: Final answer
   x = 317,727.31