Finding the Third Proportional to 5,398,617 and 8,278,365

Step by Step Solution

1. Step 1: Write the proportion equation
   5,398,617 : 8,278,365 = 8,278,365 : x
2. Step 2: Convert to fraction form
   5,398,617/8,278,365 = 8,278,365/x
3. Step 3: Cross multiply
   5,398,617x = 8,278,365 × 8,278,365
4. Step 4: Simplify right side
   5,398,617x = 68,531,327,073,225
5. Step 5: Solve for x
   x = 68,531,327,073,225/5,398,617
6. Step 6: Final answer
   x = 12,694,237.63