Finding the Fourth Proportional to 11,892.59, 16,418.50 and 8,121.23

Step by Step Solution

1. Step 1: Write the proportion equation
   11,892.59 : 16,418.50 = 8,121.23 : x
2. Step 2: Convert to fraction form
   11,892.59/16,418.50 = 8,121.23/x
3. Step 3: Cross multiply
   11,892.59x = 16,418.50 × 8,121.23
4. Step 4: Simplify right side
   11,892.59x = 133,338,373.93
5. Step 5: Solve for x
   x = 133,338,373.93/11,892.59
6. Step 6: Final answer
   x = 11,211.89