Finding the Fourth Proportional to 12,431.07, 18,644.72 and 4,111.43

Step by Step Solution

1. Step 1: Write the proportion equation
   12,431.07 : 18,644.72 = 4,111.43 : x
2. Step 2: Convert to fraction form
   12,431.07/18,644.72 = 4,111.43/x
3. Step 3: Cross multiply
   12,431.07x = 18,644.72 × 4,111.43
4. Step 4: Simplify right side
   12,431.07x = 76,656,347.37
5. Step 5: Solve for x
   x = 76,656,347.37/12,431.07
6. Step 6: Final answer
   x = 6,166.51