Finding the Third Proportional to 139,455 and 210,492

Step by Step Solution

1. Step 1: Write the proportion equation
   139,455 : 210,492 = 210,492 : x
2. Step 2: Convert to fraction form
   139,455/210,492 = 210,492/x
3. Step 3: Cross multiply
   139,455x = 210,492 × 210,492
4. Step 4: Simplify right side
   139,455x = 44,306,882,064
5. Step 5: Solve for x
   x = 44,306,882,064/139,455
6. Step 6: Final answer
   x = 317,714.55