Finding the Fourth Proportional to 9,404.20, 12,979.18 and 5,424.54

Step by Step Solution

1. Step 1: Write the proportion equation
   9,404.20 : 12,979.18 = 5,424.54 : x
2. Step 2: Convert to fraction form
   9,404.20/12,979.18 = 5,424.54/x
3. Step 3: Cross multiply
   9,404.20x = 12,979.18 × 5,424.54
4. Step 4: Simplify right side
   9,404.20x = 70,406,016.18
5. Step 5: Solve for x
   x = 70,406,016.18/9,404.20
6. Step 6: Final answer
   x = 7,486.66