Finding the Third Proportional to 296,904 and 639,733.50

Step by Step Solution

1. Step 1: Write the proportion equation
   296,904 : 639,733.50 = 639,733.50 : x
2. Step 2: Convert to fraction form
   296,904/639,733.50 = 639,733.50/x
3. Step 3: Cross multiply
   296,904x = 639,733.50 × 639,733.50
4. Step 4: Simplify right side
   296,904x = 409,258,951,022.25
5. Step 5: Solve for x
   x = 409,258,951,022.25/296,904
6. Step 6: Final answer
   x = 1,378,421.82