Finding the Third Proportional to 4,978,563 and 7,688,961

Step by Step Solution

1. Step 1: Write the proportion equation
   4,978,563 : 7,688,961 = 7,688,961 : x
2. Step 2: Convert to fraction form
   4,978,563/7,688,961 = 7,688,961/x
3. Step 3: Cross multiply
   4,978,563x = 7,688,961 × 7,688,961
4. Step 4: Simplify right side
   4,978,563x = 59,120,121,259,521
5. Step 5: Solve for x
   x = 59,120,121,259,521/4,978,563
6. Step 6: Final answer
   x = 11,874,936.86