Finding the Fourth Proportional to 21,868.05, 30,172.71 and 12,441.81

Step by Step Solution

1. Step 1: Write the proportion equation
   21,868.05 : 30,172.71 = 12,441.81 : x
2. Step 2: Convert to fraction form
   21,868.05/30,172.71 = 12,441.81/x
3. Step 3: Cross multiply
   21,868.05x = 30,172.71 × 12,441.81
4. Step 4: Simplify right side
   21,868.05x = 375,403,125.01
5. Step 5: Solve for x
   x = 375,403,125.01/21,868.05
6. Step 6: Final answer
   x = 17,166.74