Finding the Fourth Proportional to 21,939.50, 30,276.51 and 12,003.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,939.50 : 30,276.51 = 12,003.50 : x
2. Step 2: Convert to fraction form
   21,939.50/30,276.51 = 12,003.50/x
3. Step 3: Cross multiply
   21,939.50x = 30,276.51 × 12,003.50
4. Step 4: Simplify right side
   21,939.50x = 363,424,087.79
5. Step 5: Solve for x
   x = 363,424,087.79/21,939.50
6. Step 6: Final answer
   x = 16,564.83