Finding the Third Proportional to 138,391.50 and 303,189

Step by Step Solution

1. Step 1: Write the proportion equation
   138,391.50 : 303,189 = 303,189 : x
2. Step 2: Convert to fraction form
   138,391.50/303,189 = 303,189/x
3. Step 3: Cross multiply
   138,391.50x = 303,189 × 303,189
4. Step 4: Simplify right side
   138,391.50x = 91,923,569,721
5. Step 5: Solve for x
   x = 91,923,569,721/138,391.50
6. Step 6: Final answer
   x = 664,228.44