Finding the Third Proportional to 1,866,642 and 3,989,162

Step by Step Solution

1. Step 1: Write the proportion equation
   1,866,642 : 3,989,162 = 3,989,162 : x
2. Step 2: Convert to fraction form
   1,866,642/3,989,162 = 3,989,162/x
3. Step 3: Cross multiply
   1,866,642x = 3,989,162 × 3,989,162
4. Step 4: Simplify right side
   1,866,642x = 15,913,413,462,244
5. Step 5: Solve for x
   x = 15,913,413,462,244/1,866,642
6. Step 6: Final answer
   x = 8,525,155.58