Finding the Third Proportional to 4,978,511 and 7,688,889

Step by Step Solution

1. Step 1: Write the proportion equation
   4,978,511 : 7,688,889 = 7,688,889 : x
2. Step 2: Convert to fraction form
   4,978,511/7,688,889 = 7,688,889/x
3. Step 3: Cross multiply
   4,978,511x = 7,688,889 × 7,688,889
4. Step 4: Simplify right side
   4,978,511x = 59,119,014,054,321
5. Step 5: Solve for x
   x = 59,119,014,054,321/4,978,511
6. Step 6: Final answer
   x = 11,874,838.49