Finding the Third Proportional to 5,128,598 and 8,121,003

Step by Step Solution

1. Step 1: Write the proportion equation
   5,128,598 : 8,121,003 = 8,121,003 : x
2. Step 2: Convert to fraction form
   5,128,598/8,121,003 = 8,121,003/x
3. Step 3: Cross multiply
   5,128,598x = 8,121,003 × 8,121,003
4. Step 4: Simplify right side
   5,128,598x = 65,950,689,726,009
5. Step 5: Solve for x
   x = 65,950,689,726,009/5,128,598
6. Step 6: Final answer
   x = 12,859,399.34