Finding the Fourth Proportional to 21,888.39, 30,204.18 and 12,936.27

Step by Step Solution

1. Step 1: Write the proportion equation
   21,888.39 : 30,204.18 = 12,936.27 : x
2. Step 2: Convert to fraction form
   21,888.39/30,204.18 = 12,936.27/x
3. Step 3: Cross multiply
   21,888.39x = 30,204.18 × 12,936.27
4. Step 4: Simplify right side
   21,888.39x = 390,729,427.61
5. Step 5: Solve for x
   x = 390,729,427.61/21,888.39
6. Step 6: Final answer
   x = 17,850.99