Finding the Third Proportional to 5,389,144 and 8,139,667

Step by Step Solution

1. Step 1: Write the proportion equation
   5,389,144 : 8,139,667 = 8,139,667 : x
2. Step 2: Convert to fraction form
   5,389,144/8,139,667 = 8,139,667/x
3. Step 3: Cross multiply
   5,389,144x = 8,139,667 × 8,139,667
4. Step 4: Simplify right side
   5,389,144x = 66,254,178,870,889
5. Step 5: Solve for x
   x = 66,254,178,870,889/5,389,144
6. Step 6: Final answer
   x = 12,294,007.89