Finding the Fourth Proportional to 21,819.89, 30,111.27 and 12,388.25

Step by Step Solution

1. Step 1: Write the proportion equation
   21,819.89 : 30,111.27 = 12,388.25 : x
2. Step 2: Convert to fraction form
   21,819.89/30,111.27 = 12,388.25/x
3. Step 3: Cross multiply
   21,819.89x = 30,111.27 × 12,388.25
4. Step 4: Simplify right side
   21,819.89x = 373,025,940.58
5. Step 5: Solve for x
   x = 373,025,940.58/21,819.89
6. Step 6: Final answer
   x = 17,095.68