Finding the Third Proportional to 1,866,648 and 3,989,172

Step by Step Solution

1. Step 1: Write the proportion equation
   1,866,648 : 3,989,172 = 3,989,172 : x
2. Step 2: Convert to fraction form
   1,866,648/3,989,172 = 3,989,172/x
3. Step 3: Cross multiply
   1,866,648x = 3,989,172 × 3,989,172
4. Step 4: Simplify right side
   1,866,648x = 15,913,493,245,584
5. Step 5: Solve for x
   x = 15,913,493,245,584/1,866,648
6. Step 6: Final answer
   x = 8,525,170.92