Finding the Third Proportional to 5,340,390 and 8,274,459

Step by Step Solution

1. Step 1: Write the proportion equation
   5,340,390 : 8,274,459 = 8,274,459 : x
2. Step 2: Convert to fraction form
   5,340,390/8,274,459 = 8,274,459/x
3. Step 3: Cross multiply
   5,340,390x = 8,274,459 × 8,274,459
4. Step 4: Simplify right side
   5,340,390x = 68,466,671,742,681
5. Step 5: Solve for x
   x = 68,466,671,742,681/5,340,390
6. Step 6: Final answer
   x = 12,820,537.78