Finding the Third Proportional to 5,389,139 and 8,139,658

Step by Step Solution

1. Step 1: Write the proportion equation
   5,389,139 : 8,139,658 = 8,139,658 : x
2. Step 2: Convert to fraction form
   5,389,139/8,139,658 = 8,139,658/x
3. Step 3: Cross multiply
   5,389,139x = 8,139,658 × 8,139,658
4. Step 4: Simplify right side
   5,389,139x = 66,254,032,356,964
5. Step 5: Solve for x
   x = 66,254,032,356,964/5,389,139
6. Step 6: Final answer
   x = 12,293,992.11