Finding the Third Proportional to 4,978,470 and 7,688,799

Step by Step Solution

1. Step 1: Write the proportion equation
   4,978,470 : 7,688,799 = 7,688,799 : x
2. Step 2: Convert to fraction form
   4,978,470/7,688,799 = 7,688,799/x
3. Step 3: Cross multiply
   4,978,470x = 7,688,799 × 7,688,799
4. Step 4: Simplify right side
   4,978,470x = 59,117,630,062,401
5. Step 5: Solve for x
   x = 59,117,630,062,401/4,978,470
6. Step 6: Final answer
   x = 11,874,658.29