Finding the Third Proportional to 5,178,912 and 7,840,344

Step by Step Solution

1. Step 1: Write the proportion equation
   5,178,912 : 7,840,344 = 7,840,344 : x
2. Step 2: Convert to fraction form
   5,178,912/7,840,344 = 7,840,344/x
3. Step 3: Cross multiply
   5,178,912x = 7,840,344 × 7,840,344
4. Step 4: Simplify right side
   5,178,912x = 61,470,994,038,336
5. Step 5: Solve for x
   x = 61,470,994,038,336/5,178,912
6. Step 6: Final answer
   x = 11,869,480.32