Finding the Fourth Proportional to 9,165.78, 12,616.83 and 7,910.82

Step by Step Solution

1. Step 1: Write the proportion equation
   9,165.78 : 12,616.83 = 7,910.82 : x
2. Step 2: Convert to fraction form
   9,165.78/12,616.83 = 7,910.82/x
3. Step 3: Cross multiply
   9,165.78x = 12,616.83 × 7,910.82
4. Step 4: Simplify right side
   9,165.78x = 99,809,471.10
5. Step 5: Solve for x
   x = 99,809,471.10/9,165.78
6. Step 6: Final answer
   x = 10,889.36