Finding the Fourth Proportional to 15,456.42, 21,329.82 and 8,382.78

Step by Step Solution

1. Step 1: Write the proportion equation
   15,456.42 : 21,329.82 = 8,382.78 : x
2. Step 2: Convert to fraction form
   15,456.42/21,329.82 = 8,382.78/x
3. Step 3: Cross multiply
   15,456.42x = 21,329.82 × 8,382.78
4. Step 4: Simplify right side
   15,456.42x = 178,803,188.50
5. Step 5: Solve for x
   x = 178,803,188.50/15,456.42
6. Step 6: Final answer
   x = 11,568.21