Finding the Third Proportional to 299,736.50 and 641,984

Step by Step Solution

1. Step 1: Write the proportion equation
   299,736.50 : 641,984 = 641,984 : x
2. Step 2: Convert to fraction form
   299,736.50/641,984 = 641,984/x
3. Step 3: Cross multiply
   299,736.50x = 641,984 × 641,984
4. Step 4: Simplify right side
   299,736.50x = 412,143,456,256
5. Step 5: Solve for x
   x = 412,143,456,256/299,736.50
6. Step 6: Final answer
   x = 1,375,019.25