Finding the Third Proportional to 5,178,279 and 7,767,423

Step by Step Solution

1. Step 1: Write the proportion equation
   5,178,279 : 7,767,423 = 7,767,423 : x
2. Step 2: Convert to fraction form
   5,178,279/7,767,423 = 7,767,423/x
3. Step 3: Cross multiply
   5,178,279x = 7,767,423 × 7,767,423
4. Step 4: Simplify right side
   5,178,279x = 60,332,860,060,929
5. Step 5: Solve for x
   x = 60,332,860,060,929/5,178,279
6. Step 6: Final answer
   x = 11,651,141.25