Finding the Fourth Proportional to 12,729.38, 18,990.72 and 12,040.46

Step by Step Solution

1. Step 1: Write the proportion equation
   12,729.38 : 18,990.72 = 12,040.46 : x
2. Step 2: Convert to fraction form
   12,729.38/18,990.72 = 12,040.46/x
3. Step 3: Cross multiply
   12,729.38x = 18,990.72 × 12,040.46
4. Step 4: Simplify right side
   12,729.38x = 228,657,004.53
5. Step 5: Solve for x
   x = 228,657,004.53/12,729.38
6. Step 6: Final answer
   x = 17,962.93