Finding the Fourth Proportional to 15,578.72, 21,498.56 and 8,505.12

Step by Step Solution

1. Step 1: Write the proportion equation
   15,578.72 : 21,498.56 = 8,505.12 : x
2. Step 2: Convert to fraction form
   15,578.72/21,498.56 = 8,505.12/x
3. Step 3: Cross multiply
   15,578.72x = 21,498.56 × 8,505.12
4. Step 4: Simplify right side
   15,578.72x = 182,847,832.63
5. Step 5: Solve for x
   x = 182,847,832.63/15,578.72
6. Step 6: Final answer
   x = 11,737.03