Finding the Fourth Proportional to 12,111.18, 16,719.75 and 8,153.16

Step by Step Solution

1. Step 1: Write the proportion equation
   12,111.18 : 16,719.75 = 8,153.16 : x
2. Step 2: Convert to fraction form
   12,111.18/16,719.75 = 8,153.16/x
3. Step 3: Cross multiply
   12,111.18x = 16,719.75 × 8,153.16
4. Step 4: Simplify right side
   12,111.18x = 136,318,796.91
5. Step 5: Solve for x
   x = 136,318,796.91/12,111.18
6. Step 6: Final answer
   x = 11,255.62