Finding the Third Proportional to 451,878 and 978,140

Step by Step Solution

1. Step 1: Write the proportion equation
   451,878 : 978,140 = 978,140 : x
2. Step 2: Convert to fraction form
   451,878/978,140 = 978,140/x
3. Step 3: Cross multiply
   451,878x = 978,140 × 978,140
4. Step 4: Simplify right side
   451,878x = 956,757,859,600
5. Step 5: Solve for x
   x = 956,757,859,600/451,878
6. Step 6: Final answer
   x = 2,117,292.41