Finding the Fourth Proportional to 12,431.98, 18,648.42 and 4,112.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,431.98 : 18,648.42 = 4,112.20 : x
2. Step 2: Convert to fraction form
   12,431.98/18,648.42 = 4,112.20/x
3. Step 3: Cross multiply
   12,431.98x = 18,648.42 × 4,112.20
4. Step 4: Simplify right side
   12,431.98x = 76,686,032.72
5. Step 5: Solve for x
   x = 76,686,032.72/12,431.98
6. Step 6: Final answer
   x = 6,168.45