Finding the Third Proportional to 1,398,639 and 2,089,329

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398,639 : 2,089,329 = 2,089,329 : x
2. Step 2: Convert to fraction form
   1,398,639/2,089,329 = 2,089,329/x
3. Step 3: Cross multiply
   1,398,639x = 2,089,329 × 2,089,329
4. Step 4: Simplify right side
   1,398,639x = 4,365,295,670,241
5. Step 5: Solve for x
   x = 4,365,295,670,241/1,398,639
6. Step 6: Final answer
   x = 3,121,102.49