Finding the Fourth Proportional to 21,578.15, 32,371.31 and 8,429.69

Step by Step Solution

1. Step 1: Write the proportion equation
   21,578.15 : 32,371.31 = 8,429.69 : x
2. Step 2: Convert to fraction form
   21,578.15/32,371.31 = 8,429.69/x
3. Step 3: Cross multiply
   21,578.15x = 32,371.31 × 8,429.69
4. Step 4: Simplify right side
   21,578.15x = 272,880,108.19
5. Step 5: Solve for x
   x = 272,880,108.19/21,578.15
6. Step 6: Final answer
   x = 12,646.13