Finding the Third Proportional to 2,390,317 and 5,178,911

Step by Step Solution

1. Step 1: Write the proportion equation
   2,390,317 : 5,178,911 = 5,178,911 : x
2. Step 2: Convert to fraction form
   2,390,317/5,178,911 = 5,178,911/x
3. Step 3: Cross multiply
   2,390,317x = 5,178,911 × 5,178,911
4. Step 4: Simplify right side
   2,390,317x = 26,821,119,145,921
5. Step 5: Solve for x
   x = 26,821,119,145,921/2,390,317
6. Step 6: Final answer
   x = 11,220,737.31