Finding the Third Proportional to 1,390,218 and 2,149,170

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390,218 : 2,149,170 = 2,149,170 : x
2. Step 2: Convert to fraction form
   1,390,218/2,149,170 = 2,149,170/x
3. Step 3: Cross multiply
   1,390,218x = 2,149,170 × 2,149,170
4. Step 4: Simplify right side
   1,390,218x = 4,618,931,688,900
5. Step 5: Solve for x
   x = 4,618,931,688,900/1,390,218
6. Step 6: Final answer
   x = 3,322,451.36