Finding the Third Proportional to 139,389,664.50 and 287,728,533

Step by Step Solution

1. Step 1: Write the proportion equation
   139,389,664.50 : 287,728,533 = 287,728,533 : x
2. Step 2: Convert to fraction form
   139,389,664.50/287,728,533 = 287,728,533/x
3. Step 3: Cross multiply
   139,389,664.50x = 287,728,533 × 287,728,533
4. Step 4: Simplify right side
   139,389,664.50x = 82,787,708,702,332,096
5. Step 5: Solve for x
   x = 82,787,708,702,332,096/139,389,664.50
6. Step 6: Final answer
   x = 593,930,037.78