Finding the Third Proportional to 139,236 and 285,849

Step by Step Solution

1. Step 1: Write the proportion equation
   139,236 : 285,849 = 285,849 : x
2. Step 2: Convert to fraction form
   139,236/285,849 = 285,849/x
3. Step 3: Cross multiply
   139,236x = 285,849 × 285,849
4. Step 4: Simplify right side
   139,236x = 81,709,650,801
5. Step 5: Solve for x
   x = 81,709,650,801/139,236
6. Step 6: Final answer
   x = 586,842.85