Finding the Fourth Proportional to 11,972.34, 16,504.71 and 8,424.54

Step by Step Solution

1. Step 1: Write the proportion equation
   11,972.34 : 16,504.71 = 8,424.54 : x
2. Step 2: Convert to fraction form
   11,972.34/16,504.71 = 8,424.54/x
3. Step 3: Cross multiply
   11,972.34x = 16,504.71 × 8,424.54
4. Step 4: Simplify right side
   11,972.34x = 139,044,589.58
5. Step 5: Solve for x
   x = 139,044,589.58/11,972.34
6. Step 6: Final answer
   x = 11,613.82