Finding the Third Proportional to 139,243.50 and 285,864

Step by Step Solution

1. Step 1: Write the proportion equation
   139,243.50 : 285,864 = 285,864 : x
2. Step 2: Convert to fraction form
   139,243.50/285,864 = 285,864/x
3. Step 3: Cross multiply
   139,243.50x = 285,864 × 285,864
4. Step 4: Simplify right side
   139,243.50x = 81,718,226,496
5. Step 5: Solve for x
   x = 81,718,226,496/139,243.50
6. Step 6: Final answer
   x = 586,872.83