Finding the Fourth Proportional to 21,905.04, 30,227.28 and 12,471.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,905.04 : 30,227.28 = 12,471.72 : x
2. Step 2: Convert to fraction form
   21,905.04/30,227.28 = 12,471.72/x
3. Step 3: Cross multiply
   21,905.04x = 30,227.28 × 12,471.72
4. Step 4: Simplify right side
   21,905.04x = 376,986,172.52
5. Step 5: Solve for x
   x = 376,986,172.52/21,905.04
6. Step 6: Final answer
   x = 17,210.02