Finding the Third Proportional to 639,072 and 978,000

Step by Step Solution

1. Step 1: Write the proportion equation
   639,072 : 978,000 = 978,000 : x
2. Step 2: Convert to fraction form
   639,072/978,000 = 978,000/x
3. Step 3: Cross multiply
   639,072x = 978,000 × 978,000
4. Step 4: Simplify right side
   639,072x = 956,484,000,000
5. Step 5: Solve for x
   x = 956,484,000,000/639,072
6. Step 6: Final answer
   x = 1,496,676.43