Finding the Fourth Proportional to 12,196.20, 18,279.72 and 5,615.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,196.20 : 18,279.72 = 5,615.76 : x
2. Step 2: Convert to fraction form
   12,196.20/18,279.72 = 5,615.76/x
3. Step 3: Cross multiply
   12,196.20x = 18,279.72 × 5,615.76
4. Step 4: Simplify right side
   12,196.20x = 102,654,520.39
5. Step 5: Solve for x
   x = 102,654,520.39/12,196.20
6. Step 6: Final answer
   x = 8,416.93