Finding the Third Proportional to 147,380 and 315,790

Step by Step Solution

1. Step 1: Write the proportion equation
   147,380 : 315,790 = 315,790 : x
2. Step 2: Convert to fraction form
   147,380/315,790 = 315,790/x
3. Step 3: Cross multiply
   147,380x = 315,790 × 315,790
4. Step 4: Simplify right side
   147,380x = 99,723,324,100
5. Step 5: Solve for x
   x = 99,723,324,100/147,380
6. Step 6: Final answer
   x = 676,640.82