Finding the Third Proportional to 978,400 and 1,998,272

Step by Step Solution

1. Step 1: Write the proportion equation
   978,400 : 1,998,272 = 1,998,272 : x
2. Step 2: Convert to fraction form
   978,400/1,998,272 = 1,998,272/x
3. Step 3: Cross multiply
   978,400x = 1,998,272 × 1,998,272
4. Step 4: Simplify right side
   978,400x = 3,993,090,985,984
5. Step 5: Solve for x
   x = 3,993,090,985,984/978,400
6. Step 6: Final answer
   x = 4,081,245.90