Finding the Fourth Proportional to 21,941.50, 30,279.28 and 12,005.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,941.50 : 30,279.28 = 12,005.50 : x
2. Step 2: Convert to fraction form
   21,941.50/30,279.28 = 12,005.50/x
3. Step 3: Cross multiply
   21,941.50x = 30,279.28 × 12,005.50
4. Step 4: Simplify right side
   21,941.50x = 363,517,896.04
5. Step 5: Solve for x
   x = 363,517,896.04/21,941.50
6. Step 6: Final answer
   x = 16,567.60