Finding the Third Proportional to 639,074 and 978,003

Step by Step Solution

1. Step 1: Write the proportion equation
   639,074 : 978,003 = 978,003 : x
2. Step 2: Convert to fraction form
   639,074/978,003 = 978,003/x
3. Step 3: Cross multiply
   639,074x = 978,003 × 978,003
4. Step 4: Simplify right side
   639,074x = 956,489,868,009
5. Step 5: Solve for x
   x = 956,489,868,009/639,074
6. Step 6: Final answer
   x = 1,496,680.93