Finding the Fourth Proportional to 10,936.89, 16,408.78 and 3,916.76

Step by Step Solution

1. Step 1: Write the proportion equation
   10,936.89 : 16,408.78 = 3,916.76 : x
2. Step 2: Convert to fraction form
   10,936.89/16,408.78 = 3,916.76/x
3. Step 3: Cross multiply
   10,936.89x = 16,408.78 × 3,916.76
4. Step 4: Simplify right side
   10,936.89x = 64,269,161.32
5. Step 5: Solve for x
   x = 64,269,161.32/10,936.89
6. Step 6: Final answer
   x = 5,876.37