Finding the Fourth Proportional to 12,111.16, 18,167.78 and 4,318.04

Step by Step Solution

1. Step 1: Write the proportion equation
   12,111.16 : 18,167.78 = 4,318.04 : x
2. Step 2: Convert to fraction form
   12,111.16/18,167.78 = 4,318.04/x
3. Step 3: Cross multiply
   12,111.16x = 18,167.78 × 4,318.04
4. Step 4: Simplify right side
   12,111.16x = 78,449,200.75
5. Step 5: Solve for x
   x = 78,449,200.75/12,111.16
6. Step 6: Final answer
   x = 6,477.43