Finding the Fourth Proportional to 21,819.52, 30,110.64 and 12,388

Step by Step Solution

1. Step 1: Write the proportion equation
   21,819.52 : 30,110.64 = 12,388 : x
2. Step 2: Convert to fraction form
   21,819.52/30,110.64 = 12,388/x
3. Step 3: Cross multiply
   21,819.52x = 30,110.64 × 12,388
4. Step 4: Simplify right side
   21,819.52x = 373,010,608.32
5. Step 5: Solve for x
   x = 373,010,608.32/21,819.52
6. Step 6: Final answer
   x = 17,095.27