Finding the Third Proportional to 5,389,151 and 8,139,678

Step by Step Solution

1. Step 1: Write the proportion equation
   5,389,151 : 8,139,678 = 8,139,678 : x
2. Step 2: Convert to fraction form
   5,389,151/8,139,678 = 8,139,678/x
3. Step 3: Cross multiply
   5,389,151x = 8,139,678 × 8,139,678
4. Step 4: Simplify right side
   5,389,151x = 66,254,357,943,684
5. Step 5: Solve for x
   x = 66,254,357,943,684/5,389,151
6. Step 6: Final answer
   x = 12,294,025.15