Finding the Fourth Proportional to 9,369.48, 12,928.89 and 5,391.18

Step by Step Solution

1. Step 1: Write the proportion equation
   9,369.48 : 12,928.89 = 5,391.18 : x
2. Step 2: Convert to fraction form
   9,369.48/12,928.89 = 5,391.18/x
3. Step 3: Cross multiply
   9,369.48x = 12,928.89 × 5,391.18
4. Step 4: Simplify right side
   9,369.48x = 69,701,973.19
5. Step 5: Solve for x
   x = 69,701,973.19/9,369.48
6. Step 6: Final answer
   x = 7,439.26