Finding the Third Proportional to 4,118,628 and 8,578,147

Step by Step Solution

1. Step 1: Write the proportion equation
   4,118,628 : 8,578,147 = 8,578,147 : x
2. Step 2: Convert to fraction form
   4,118,628/8,578,147 = 8,578,147/x
3. Step 3: Cross multiply
   4,118,628x = 8,578,147 × 8,578,147
4. Step 4: Simplify right side
   4,118,628x = 73,584,605,953,609
5. Step 5: Solve for x
   x = 73,584,605,953,609/4,118,628
6. Step 6: Final answer
   x = 17,866,290.90