Finding the Third Proportional to 5,389,145 and 8,139,669

Step by Step Solution

1. Step 1: Write the proportion equation
   5,389,145 : 8,139,669 = 8,139,669 : x
2. Step 2: Convert to fraction form
   5,389,145/8,139,669 = 8,139,669/x
3. Step 3: Cross multiply
   5,389,145x = 8,139,669 × 8,139,669
4. Step 4: Simplify right side
   5,389,145x = 66,254,211,429,561
5. Step 5: Solve for x
   x = 66,254,211,429,561/5,389,145
6. Step 6: Final answer
   x = 12,294,011.65