Finding the Third Proportional to 864,638 and 1,381,280

Step by Step Solution

1. Step 1: Write the proportion equation
   864,638 : 1,381,280 = 1,381,280 : x
2. Step 2: Convert to fraction form
   864,638/1,381,280 = 1,381,280/x
3. Step 3: Cross multiply
   864,638x = 1,381,280 × 1,381,280
4. Step 4: Simplify right side
   864,638x = 1,907,934,438,400
5. Step 5: Solve for x
   x = 1,907,934,438,400/864,638
6. Step 6: Final answer
   x = 2,206,628.02