Finding the Fourth Proportional to 21,019.02, 31,476.66 and 12,227.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,019.02 : 31,476.66 = 12,227.28 : x
2. Step 2: Convert to fraction form
   21,019.02/31,476.66 = 12,227.28/x
3. Step 3: Cross multiply
   21,019.02x = 31,476.66 × 12,227.28
4. Step 4: Simplify right side
   21,019.02x = 384,873,935.28
5. Step 5: Solve for x
   x = 384,873,935.28/21,019.02
6. Step 6: Final answer
   x = 18,310.75