Finding the Third Proportional to 298,471.50 and 644,226

Step by Step Solution

1. Step 1: Write the proportion equation
   298,471.50 : 644,226 = 644,226 : x
2. Step 2: Convert to fraction form
   298,471.50/644,226 = 644,226/x
3. Step 3: Cross multiply
   298,471.50x = 644,226 × 644,226
4. Step 4: Simplify right side
   298,471.50x = 415,027,139,076
5. Step 5: Solve for x
   x = 415,027,139,076/298,471.50
6. Step 6: Final answer
   x = 1,390,508.44