Finding the Fourth Proportional to 11,060.72, 16,599.60 and 8,256.57

Step by Step Solution

1. Step 1: Write the proportion equation
   11,060.72 : 16,599.60 = 8,256.57 : x
2. Step 2: Convert to fraction form
   11,060.72/16,599.60 = 8,256.57/x
3. Step 3: Cross multiply
   11,060.72x = 16,599.60 × 8,256.57
4. Step 4: Simplify right side
   11,060.72x = 137,055,697.12
5. Step 5: Solve for x
   x = 137,055,697.12/11,060.72
6. Step 6: Final answer
   x = 12,391.21