Finding the Third Proportional to 5,389,142 and 8,139,664

Step by Step Solution

1. Step 1: Write the proportion equation
   5,389,142 : 8,139,664 = 8,139,664 : x
2. Step 2: Convert to fraction form
   5,389,142/8,139,664 = 8,139,664/x
3. Step 3: Cross multiply
   5,389,142x = 8,139,664 × 8,139,664
4. Step 4: Simplify right side
   5,389,142x = 66,254,130,032,896
5. Step 5: Solve for x
   x = 66,254,130,032,896/5,389,142
6. Step 6: Final answer
   x = 12,294,003.39