Finding the Fourth Proportional to 21,860.48, 30,172.25 and 13,901.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,860.48 : 30,172.25 = 13,901.15 : x
2. Step 2: Convert to fraction form
   21,860.48/30,172.25 = 13,901.15/x
3. Step 3: Cross multiply
   21,860.48x = 30,172.25 × 13,901.15
4. Step 4: Simplify right side
   21,860.48x = 419,429,083.27
5. Step 5: Solve for x
   x = 419,429,083.27/21,860.48
6. Step 6: Final answer
   x = 19,186.63