Finding the Fourth Proportional to 12,111.23, 16,719.17 and 8,084.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,111.23 : 16,719.17 = 8,084.78 : x
2. Step 2: Convert to fraction form
   12,111.23/16,719.17 = 8,084.78/x
3. Step 3: Cross multiply
   12,111.23x = 16,719.17 × 8,084.78
4. Step 4: Simplify right side
   12,111.23x = 135,170,687.21
5. Step 5: Solve for x
   x = 135,170,687.21/12,111.23
6. Step 6: Final answer
   x = 11,160.78