Finding the Fourth Proportional to 22,199.78, 30,636.15 and 12,768.95

Step by Step Solution

1. Step 1: Write the proportion equation
   22,199.78 : 30,636.15 = 12,768.95 : x
2. Step 2: Convert to fraction form
   22,199.78/30,636.15 = 12,768.95/x
3. Step 3: Cross multiply
   22,199.78x = 30,636.15 × 12,768.95
4. Step 4: Simplify right side
   22,199.78x = 391,191,467.54
5. Step 5: Solve for x
   x = 391,191,467.54/22,199.78
6. Step 6: Final answer
   x = 17,621.41