Finding the Third Proportional to 1,396,420 and 2,135,210

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396,420 : 2,135,210 = 2,135,210 : x
2. Step 2: Convert to fraction form
   1,396,420/2,135,210 = 2,135,210/x
3. Step 3: Cross multiply
   1,396,420x = 2,135,210 × 2,135,210
4. Step 4: Simplify right side
   1,396,420x = 4,559,121,744,100
5. Step 5: Solve for x
   x = 4,559,121,744,100/1,396,420
6. Step 6: Final answer
   x = 3,264,864.26