Finding the Third Proportional to 646,520 and 978,778

Step by Step Solution

1. Step 1: Write the proportion equation
   646,520 : 978,778 = 978,778 : x
2. Step 2: Convert to fraction form
   646,520/978,778 = 978,778/x
3. Step 3: Cross multiply
   646,520x = 978,778 × 978,778
4. Step 4: Simplify right side
   646,520x = 958,006,373,284
5. Step 5: Solve for x
   x = 958,006,373,284/646,520
6. Step 6: Final answer
   x = 1,481,789.23