Finding the Third Proportional to 1,866,672 and 3,989,216

Step by Step Solution

1. Step 1: Write the proportion equation
   1,866,672 : 3,989,216 = 3,989,216 : x
2. Step 2: Convert to fraction form
   1,866,672/3,989,216 = 3,989,216/x
3. Step 3: Cross multiply
   1,866,672x = 3,989,216 × 3,989,216
4. Step 4: Simplify right side
   1,866,672x = 15,913,844,294,656
5. Step 5: Solve for x
   x = 15,913,844,294,656/1,866,672
6. Step 6: Final answer
   x = 8,525,249.37