Finding the Fourth Proportional to 10,057.72, 15,003.92 and 8,587.57

Step by Step Solution

1. Step 1: Write the proportion equation
   10,057.72 : 15,003.92 = 8,587.57 : x
2. Step 2: Convert to fraction form
   10,057.72/15,003.92 = 8,587.57/x
3. Step 3: Cross multiply
   10,057.72x = 15,003.92 × 8,587.57
4. Step 4: Simplify right side
   10,057.72x = 128,847,213.27
5. Step 5: Solve for x
   x = 128,847,213.27/10,057.72
6. Step 6: Final answer
   x = 12,810.78