Finding the Fourth Proportional to 21,819.76, 30,110.88 and 12,388.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,819.76 : 30,110.88 = 12,388.12 : x
2. Step 2: Convert to fraction form
   21,819.76/30,110.88 = 12,388.12/x
3. Step 3: Cross multiply
   21,819.76x = 30,110.88 × 12,388.12
4. Step 4: Simplify right side
   21,819.76x = 373,017,194.75
5. Step 5: Solve for x
   x = 373,017,194.75/21,819.76
6. Step 6: Final answer
   x = 17,095.38