Finding the Third Proportional to 1,687,680 and 3,639,231

Step by Step Solution

1. Step 1: Write the proportion equation
   1,687,680 : 3,639,231 = 3,639,231 : x
2. Step 2: Convert to fraction form
   1,687,680/3,639,231 = 3,639,231/x
3. Step 3: Cross multiply
   1,687,680x = 3,639,231 × 3,639,231
4. Step 4: Simplify right side
   1,687,680x = 13,244,002,271,361
5. Step 5: Solve for x
   x = 13,244,002,271,361/1,687,680
6. Step 6: Final answer
   x = 7,847,460.58