Finding the Third Proportional to 1,687,660 and 3,639,200

Step by Step Solution

1. Step 1: Write the proportion equation
   1,687,660 : 3,639,200 = 3,639,200 : x
2. Step 2: Convert to fraction form
   1,687,660/3,639,200 = 3,639,200/x
3. Step 3: Cross multiply
   1,687,660x = 3,639,200 × 3,639,200
4. Step 4: Simplify right side
   1,687,660x = 13,243,776,640,000
5. Step 5: Solve for x
   x = 13,243,776,640,000/1,687,660
6. Step 6: Final answer
   x = 7,847,419.88