Finding the Third Proportional to 5,389,143 and 8,139,663

Step by Step Solution

1. Step 1: Write the proportion equation
   5,389,143 : 8,139,663 = 8,139,663 : x
2. Step 2: Convert to fraction form
   5,389,143/8,139,663 = 8,139,663/x
3. Step 3: Cross multiply
   5,389,143x = 8,139,663 × 8,139,663
4. Step 4: Simplify right side
   5,389,143x = 66,254,113,753,569
5. Step 5: Solve for x
   x = 66,254,113,753,569/5,389,143
6. Step 6: Final answer
   x = 12,293,998.09