Finding the Fourth Proportional to 15,111.96, 20,857.89 and 8,399.94

Step by Step Solution

1. Step 1: Write the proportion equation
   15,111.96 : 20,857.89 = 8,399.94 : x
2. Step 2: Convert to fraction form
   15,111.96/20,857.89 = 8,399.94/x
3. Step 3: Cross multiply
   15,111.96x = 20,857.89 × 8,399.94
4. Step 4: Simplify right side
   15,111.96x = 175,205,024.53
5. Step 5: Solve for x
   x = 175,205,024.53/15,111.96
6. Step 6: Final answer
   x = 11,593.80