Finding the Fourth Proportional to 21,819.54, 30,111.39 and 12,388.08

Step by Step Solution

1. Step 1: Write the proportion equation
   21,819.54 : 30,111.39 = 12,388.08 : x
2. Step 2: Convert to fraction form
   21,819.54/30,111.39 = 12,388.08/x
3. Step 3: Cross multiply
   21,819.54x = 30,111.39 × 12,388.08
4. Step 4: Simplify right side
   21,819.54x = 373,022,308.23
5. Step 5: Solve for x
   x = 373,022,308.23/21,819.54
6. Step 6: Final answer
   x = 17,095.79