Finding the Third Proportional to 2,389,866 and 5,178,138

Step by Step Solution

1. Step 1: Write the proportion equation
   2,389,866 : 5,178,138 = 5,178,138 : x
2. Step 2: Convert to fraction form
   2,389,866/5,178,138 = 5,178,138/x
3. Step 3: Cross multiply
   2,389,866x = 5,178,138 × 5,178,138
4. Step 4: Simplify right side
   2,389,866x = 26,813,113,147,044
5. Step 5: Solve for x
   x = 26,813,113,147,044/2,389,866
6. Step 6: Final answer
   x = 11,219,504.84