Finding the Third Proportional to 315,425 and 672,142

Step by Step Solution

1. Step 1: Write the proportion equation
   315,425 : 672,142 = 672,142 : x
2. Step 2: Convert to fraction form
   315,425/672,142 = 672,142/x
3. Step 3: Cross multiply
   315,425x = 672,142 × 672,142
4. Step 4: Simplify right side
   315,425x = 451,774,868,164
5. Step 5: Solve for x
   x = 451,774,868,164/315,425
6. Step 6: Final answer
   x = 1,432,273.50