Finding the Third Proportional to 156,728 and 338,390

Step by Step Solution

1. Step 1: Write the proportion equation
   156,728 : 338,390 = 338,390 : x
2. Step 2: Convert to fraction form
   156,728/338,390 = 338,390/x
3. Step 3: Cross multiply
   156,728x = 338,390 × 338,390
4. Step 4: Simplify right side
   156,728x = 114,507,792,100
5. Step 5: Solve for x
   x = 114,507,792,100/156,728
6. Step 6: Final answer
   x = 730,614.77