Finding the Fourth Proportional to 15,578.72, 21,500.52 and 8,865.98

Step by Step Solution

1. Step 1: Write the proportion equation
   15,578.72 : 21,500.52 = 8,865.98 : x
2. Step 2: Convert to fraction form
   15,578.72/21,500.52 = 8,865.98/x
3. Step 3: Cross multiply
   15,578.72x = 21,500.52 × 8,865.98
4. Step 4: Simplify right side
   15,578.72x = 190,623,180.31
5. Step 5: Solve for x
   x = 190,623,180.31/15,578.72
6. Step 6: Final answer
   x = 12,236.13