Finding the Fourth Proportional to 9,616.78, 14,427.20 and 5,458.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,616.78 : 14,427.20 = 5,458.78 : x
2. Step 2: Convert to fraction form
   9,616.78/14,427.20 = 5,458.78/x
3. Step 3: Cross multiply
   9,616.78x = 14,427.20 × 5,458.78
4. Step 4: Simplify right side
   9,616.78x = 78,754,910.82
5. Step 5: Solve for x
   x = 78,754,910.82/9,616.78
6. Step 6: Final answer
   x = 8,189.32