Finding the Fourth Proportional to 21,875, 30,187.23 and 12,443.54

Step by Step Solution

1. Step 1: Write the proportion equation
   21,875 : 30,187.23 = 12,443.54 : x
2. Step 2: Convert to fraction form
   21,875/30,187.23 = 12,443.54/x
3. Step 3: Cross multiply
   21,875x = 30,187.23 × 12,443.54
4. Step 4: Simplify right side
   21,875x = 375,636,003.99
5. Step 5: Solve for x
   x = 375,636,003.99/21,875
6. Step 6: Final answer
   x = 17,171.93