Finding the Third Proportional to 7,710,949 and 11,978,238

Step by Step Solution

1. Step 1: Write the proportion equation
   7,710,949 : 11,978,238 = 11,978,238 : x
2. Step 2: Convert to fraction form
   7,710,949/11,978,238 = 11,978,238/x
3. Step 3: Cross multiply
   7,710,949x = 11,978,238 × 11,978,238
4. Step 4: Simplify right side
   7,710,949x = 143,478,185,584,644
5. Step 5: Solve for x
   x = 143,478,185,584,644/7,710,949
6. Step 6: Final answer
   x = 18,607,072.31