Finding the Third Proportional to 298,216.50 and 640,929

Step by Step Solution

1. Step 1: Write the proportion equation
   298,216.50 : 640,929 = 640,929 : x
2. Step 2: Convert to fraction form
   298,216.50/640,929 = 640,929/x
3. Step 3: Cross multiply
   298,216.50x = 640,929 × 640,929
4. Step 4: Simplify right side
   298,216.50x = 410,789,983,041
5. Step 5: Solve for x
   x = 410,789,983,041/298,216.50
6. Step 6: Final answer
   x = 1,377,489.12