Finding the Third Proportional to 1,800,636 and 3,900,210

Step by Step Solution

1. Step 1: Write the proportion equation
   1,800,636 : 3,900,210 = 3,900,210 : x
2. Step 2: Convert to fraction form
   1,800,636/3,900,210 = 3,900,210/x
3. Step 3: Cross multiply
   1,800,636x = 3,900,210 × 3,900,210
4. Step 4: Simplify right side
   1,800,636x = 15,211,638,044,100
5. Step 5: Solve for x
   x = 15,211,638,044,100/1,800,636
6. Step 6: Final answer
   x = 8,447,925.09