Finding the Third Proportional to 147,385 and 315,800

Step by Step Solution

1. Step 1: Write the proportion equation
   147,385 : 315,800 = 315,800 : x
2. Step 2: Convert to fraction form
   147,385/315,800 = 315,800/x
3. Step 3: Cross multiply
   147,385x = 315,800 × 315,800
4. Step 4: Simplify right side
   147,385x = 99,729,640,000
5. Step 5: Solve for x
   x = 99,729,640,000/147,385
6. Step 6: Final answer
   x = 676,660.72