Finding the Third Proportional to 978,598 and 2,120,048

Step by Step Solution

1. Step 1: Write the proportion equation
   978,598 : 2,120,048 = 2,120,048 : x
2. Step 2: Convert to fraction form
   978,598/2,120,048 = 2,120,048/x
3. Step 3: Cross multiply
   978,598x = 2,120,048 × 2,120,048
4. Step 4: Simplify right side
   978,598x = 4,494,603,522,304
5. Step 5: Solve for x
   x = 4,494,603,522,304/978,598
6. Step 6: Final answer
   x = 4,592,900.78