Finding the Fourth Proportional to 13,179.78, 18,200.16 and 8,472.24

Step by Step Solution

1. Step 1: Write the proportion equation
   13,179.78 : 18,200.16 = 8,472.24 : x
2. Step 2: Convert to fraction form
   13,179.78/18,200.16 = 8,472.24/x
3. Step 3: Cross multiply
   13,179.78x = 18,200.16 × 8,472.24
4. Step 4: Simplify right side
   13,179.78x = 154,196,123.56
5. Step 5: Solve for x
   x = 154,196,123.56/13,179.78
6. Step 6: Final answer
   x = 11,699.45