Finding the Fourth Proportional to 12,216.40, 16,857.48 and 7,499.92

Step by Step Solution

1. Step 1: Write the proportion equation
   12,216.40 : 16,857.48 = 7,499.92 : x
2. Step 2: Convert to fraction form
   12,216.40/16,857.48 = 7,499.92/x
3. Step 3: Cross multiply
   12,216.40x = 16,857.48 × 7,499.92
4. Step 4: Simplify right side
   12,216.40x = 126,429,751.40
5. Step 5: Solve for x
   x = 126,429,751.40/12,216.40
6. Step 6: Final answer
   x = 10,349.18