Finding the Third Proportional to 5,398,620 and 8,278,370

Step by Step Solution

1. Step 1: Write the proportion equation
   5,398,620 : 8,278,370 = 8,278,370 : x
2. Step 2: Convert to fraction form
   5,398,620/8,278,370 = 8,278,370/x
3. Step 3: Cross multiply
   5,398,620x = 8,278,370 × 8,278,370
4. Step 4: Simplify right side
   5,398,620x = 68,531,409,856,900
5. Step 5: Solve for x
   x = 68,531,409,856,900/5,398,620
6. Step 6: Final answer
   x = 12,694,245.91