Finding the Third Proportional to 4,147,978 and 8,627,047

Step by Step Solution

1. Step 1: Write the proportion equation
   4,147,978 : 8,627,047 = 8,627,047 : x
2. Step 2: Convert to fraction form
   4,147,978/8,627,047 = 8,627,047/x
3. Step 3: Cross multiply
   4,147,978x = 8,627,047 × 8,627,047
4. Step 4: Simplify right side
   4,147,978x = 74,425,939,940,209
5. Step 5: Solve for x
   x = 74,425,939,940,209/4,147,978
6. Step 6: Final answer
   x = 17,942,703.64