Finding the Fourth Proportional to 9,403.21, 12,975.93 and 5,424.09

Step by Step Solution

1. Step 1: Write the proportion equation
   9,403.21 : 12,975.93 = 5,424.09 : x
2. Step 2: Convert to fraction form
   9,403.21/12,975.93 = 5,424.09/x
3. Step 3: Cross multiply
   9,403.21x = 12,975.93 × 5,424.09
4. Step 4: Simplify right side
   9,403.21x = 70,382,547.27
5. Step 5: Solve for x
   x = 70,382,547.27/9,403.21
6. Step 6: Final answer
   x = 7,484.95