Finding the Third Proportional to 449,390 and 978,120

Step by Step Solution

1. Step 1: Write the proportion equation
   449,390 : 978,120 = 978,120 : x
2. Step 2: Convert to fraction form
   449,390/978,120 = 978,120/x
3. Step 3: Cross multiply
   449,390x = 978,120 × 978,120
4. Step 4: Simplify right side
   449,390x = 956,718,734,400
5. Step 5: Solve for x
   x = 956,718,734,400/449,390
6. Step 6: Final answer
   x = 2,128,927.51