Finding the Third Proportional to 1,310,638 and 1,978,000

Step by Step Solution

1. Step 1: Write the proportion equation
   1,310,638 : 1,978,000 = 1,978,000 : x
2. Step 2: Convert to fraction form
   1,310,638/1,978,000 = 1,978,000/x
3. Step 3: Cross multiply
   1,310,638x = 1,978,000 × 1,978,000
4. Step 4: Simplify right side
   1,310,638x = 3,912,484,000,000
5. Step 5: Solve for x
   x = 3,912,484,000,000/1,310,638
6. Step 6: Final answer
   x = 2,985,175.16