Finding the Fourth Proportional to 9,456.45, 13,055.49 and 8,405.48

Step by Step Solution

1. Step 1: Write the proportion equation
   9,456.45 : 13,055.49 = 8,405.48 : x
2. Step 2: Convert to fraction form
   9,456.45/13,055.49 = 8,405.48/x
3. Step 3: Cross multiply
   9,456.45x = 13,055.49 × 8,405.48
4. Step 4: Simplify right side
   9,456.45x = 109,737,594.81
5. Step 5: Solve for x
   x = 109,737,594.81/9,456.45
6. Step 6: Final answer
   x = 11,604.52