Finding the Third Proportional to 864,636 and 1,381,272

Step by Step Solution

1. Step 1: Write the proportion equation
   864,636 : 1,381,272 = 1,381,272 : x
2. Step 2: Convert to fraction form
   864,636/1,381,272 = 1,381,272/x
3. Step 3: Cross multiply
   864,636x = 1,381,272 × 1,381,272
4. Step 4: Simplify right side
   864,636x = 1,907,912,337,984
5. Step 5: Solve for x
   x = 1,907,912,337,984/864,636
6. Step 6: Final answer
   x = 2,206,607.56