Finding the Third Proportional to 1,290,618 and 1,997,379

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290,618 : 1,997,379 = 1,997,379 : x
2. Step 2: Convert to fraction form
   1,290,618/1,997,379 = 1,997,379/x
3. Step 3: Cross multiply
   1,290,618x = 1,997,379 × 1,997,379
4. Step 4: Simplify right side
   1,290,618x = 3,989,522,869,641
5. Step 5: Solve for x
   x = 3,989,522,869,641/1,290,618
6. Step 6: Final answer
   x = 3,091,172.50