Finding the Third Proportional to 298,648.69 and 644,842.69

Step by Step Solution

1. Step 1: Write the proportion equation
   298,648.69 : 644,842.69 = 644,842.69 : x
2. Step 2: Convert to fraction form
   298,648.69/644,842.69 = 644,842.69/x
3. Step 3: Cross multiply
   298,648.69x = 644,842.69 × 644,842.69
4. Step 4: Simplify right side
   298,648.69x = 415,822,091,622.22
5. Step 5: Solve for x
   x = 415,822,091,622.22/298,648.69
6. Step 6: Final answer
   x = 1,392,345.28