Finding the Third Proportional to 646,692 and 978,985

Step by Step Solution

1. Step 1: Write the proportion equation
   646,692 : 978,985 = 978,985 : x
2. Step 2: Convert to fraction form
   646,692/978,985 = 978,985/x
3. Step 3: Cross multiply
   646,692x = 978,985 × 978,985
4. Step 4: Simplify right side
   646,692x = 958,411,630,225
5. Step 5: Solve for x
   x = 958,411,630,225/646,692
6. Step 6: Final answer
   x = 1,482,021.78