Finding the Third Proportional to 298,867.50 and 644,964

Step by Step Solution

1. Step 1: Write the proportion equation
   298,867.50 : 644,964 = 644,964 : x
2. Step 2: Convert to fraction form
   298,867.50/644,964 = 644,964/x
3. Step 3: Cross multiply
   298,867.50x = 644,964 × 644,964
4. Step 4: Simplify right side
   298,867.50x = 415,978,561,296
5. Step 5: Solve for x
   x = 415,978,561,296/298,867.50
6. Step 6: Final answer
   x = 1,391,849.44