Finding the Third Proportional to 139,530 and 298,740

Step by Step Solution

1. Step 1: Write the proportion equation
   139,530 : 298,740 = 298,740 : x
2. Step 2: Convert to fraction form
   139,530/298,740 = 298,740/x
3. Step 3: Cross multiply
   139,530x = 298,740 × 298,740
4. Step 4: Simplify right side
   139,530x = 89,245,587,600
5. Step 5: Solve for x
   x = 89,245,587,600/139,530
6. Step 6: Final answer
   x = 639,615.76