Finding the Third Proportional to 298,434 and 641,040

Step by Step Solution

1. Step 1: Write the proportion equation
   298,434 : 641,040 = 641,040 : x
2. Step 2: Convert to fraction form
   298,434/641,040 = 641,040/x
3. Step 3: Cross multiply
   298,434x = 641,040 × 641,040
4. Step 4: Simplify right side
   298,434x = 410,932,281,600
5. Step 5: Solve for x
   x = 410,932,281,600/298,434
6. Step 6: Final answer
   x = 1,376,962.01