Finding the Third Proportional to 1,820,220 and 3,972,216

Step by Step Solution

1. Step 1: Write the proportion equation
   1,820,220 : 3,972,216 = 3,972,216 : x
2. Step 2: Convert to fraction form
   1,820,220/3,972,216 = 3,972,216/x
3. Step 3: Cross multiply
   1,820,220x = 3,972,216 × 3,972,216
4. Step 4: Simplify right side
   1,820,220x = 15,778,499,950,656
5. Step 5: Solve for x
   x = 15,778,499,950,656/1,820,220
6. Step 6: Final answer
   x = 8,668,457.63