Finding the Third Proportional to 5,128,603 and 8,121,014

Step by Step Solution

1. Step 1: Write the proportion equation
   5,128,603 : 8,121,014 = 8,121,014 : x
2. Step 2: Convert to fraction form
   5,128,603/8,121,014 = 8,121,014/x
3. Step 3: Cross multiply
   5,128,603x = 8,121,014 × 8,121,014
4. Step 4: Simplify right side
   5,128,603x = 65,950,868,388,196
5. Step 5: Solve for x
   x = 65,950,868,388,196/5,128,603
6. Step 6: Final answer
   x = 12,859,421.64