Finding the Fourth Proportional to 12,112.56, 18,168.32 and 4,216.87

Step by Step Solution

1. Step 1: Write the proportion equation
   12,112.56 : 18,168.32 = 4,216.87 : x
2. Step 2: Convert to fraction form
   12,112.56/18,168.32 = 4,216.87/x
3. Step 3: Cross multiply
   12,112.56x = 18,168.32 × 4,216.87
4. Step 4: Simplify right side
   12,112.56x = 76,613,443.56
5. Step 5: Solve for x
   x = 76,613,443.56/12,112.56
6. Step 6: Final answer
   x = 6,325.12