Finding the Fourth Proportional to 9,409.27, 12,986.17 and 5,429.60

Step by Step Solution

1. Step 1: Write the proportion equation
   9,409.27 : 12,986.17 = 5,429.60 : x
2. Step 2: Convert to fraction form
   9,409.27/12,986.17 = 5,429.60/x
3. Step 3: Cross multiply
   9,409.27x = 12,986.17 × 5,429.60
4. Step 4: Simplify right side
   9,409.27x = 70,509,708.63
5. Step 5: Solve for x
   x = 70,509,708.63/9,409.27
6. Step 6: Final answer
   x = 7,493.64