Finding the Fourth Proportional to 25,408.78, 38,112.83 and 7,878.62

Step by Step Solution

1. Step 1: Write the proportion equation
   25,408.78 : 38,112.83 = 7,878.62 : x
2. Step 2: Convert to fraction form
   25,408.78/38,112.83 = 7,878.62/x
3. Step 3: Cross multiply
   25,408.78x = 38,112.83 × 7,878.62
4. Step 4: Simplify right side
   25,408.78x = 300,276,504.69
5. Step 5: Solve for x
   x = 300,276,504.69/25,408.78
6. Step 6: Final answer
   x = 11,817.82