Finding the Fourth Proportional to 9,391.28, 12,959.33 and 5,412.69

Step by Step Solution

1. Step 1: Write the proportion equation
   9,391.28 : 12,959.33 = 5,412.69 : x
2. Step 2: Convert to fraction form
   9,391.28/12,959.33 = 5,412.69/x
3. Step 3: Cross multiply
   9,391.28x = 12,959.33 × 5,412.69
4. Step 4: Simplify right side
   9,391.28x = 70,144,808.83
5. Step 5: Solve for x
   x = 70,144,808.83/9,391.28
6. Step 6: Final answer
   x = 7,469.15