Finding the Third Proportional to 139,389,693 and 287,728,590

Step by Step Solution

1. Step 1: Write the proportion equation
   139,389,693 : 287,728,590 = 287,728,590 : x
2. Step 2: Convert to fraction form
   139,389,693/287,728,590 = 287,728,590/x
3. Step 3: Cross multiply
   139,389,693x = 287,728,590 × 287,728,590
4. Step 4: Simplify right side
   139,389,693x = 82,787,741,503,388,096
5. Step 5: Solve for x
   x = 82,787,741,503,388,096/139,389,693
6. Step 6: Final answer
   x = 593,930,151.66