Finding the Third Proportional to 5,644,378 and 8,479,278

Step by Step Solution

1. Step 1: Write the proportion equation
   5,644,378 : 8,479,278 = 8,479,278 : x
2. Step 2: Convert to fraction form
   5,644,378/8,479,278 = 8,479,278/x
3. Step 3: Cross multiply
   5,644,378x = 8,479,278 × 8,479,278
4. Step 4: Simplify right side
   5,644,378x = 71,898,155,401,284
5. Step 5: Solve for x
   x = 71,898,155,401,284/5,644,378
6. Step 6: Final answer
   x = 12,738,012.12