Finding the Third Proportional to 4,978,416 and 7,688,715

Step by Step Solution

1. Step 1: Write the proportion equation
   4,978,416 : 7,688,715 = 7,688,715 : x
2. Step 2: Convert to fraction form
   4,978,416/7,688,715 = 7,688,715/x
3. Step 3: Cross multiply
   4,978,416x = 7,688,715 × 7,688,715
4. Step 4: Simplify right side
   4,978,416x = 59,116,338,351,225
5. Step 5: Solve for x
   x = 59,116,338,351,225/4,978,416
6. Step 6: Final answer
   x = 11,874,527.63