Finding the Fourth Proportional to 15,111.29, 20,847.61 and 8,736.71

Step by Step Solution

1. Step 1: Write the proportion equation
   15,111.29 : 20,847.61 = 8,736.71 : x
2. Step 2: Convert to fraction form
   15,111.29/20,847.61 = 8,736.71/x
3. Step 3: Cross multiply
   15,111.29x = 20,847.61 × 8,736.71
4. Step 4: Simplify right side
   15,111.29x = 182,139,479.08
5. Step 5: Solve for x
   x = 182,139,479.08/15,111.29
6. Step 6: Final answer
   x = 12,053.21