Finding the Fourth Proportional to 11,112.72, 16,668.24 and 3,321.60

Step by Step Solution

1. Step 1: Write the proportion equation
   11,112.72 : 16,668.24 = 3,321.60 : x
2. Step 2: Convert to fraction form
   11,112.72/16,668.24 = 3,321.60/x
3. Step 3: Cross multiply
   11,112.72x = 16,668.24 × 3,321.60
4. Step 4: Simplify right side
   11,112.72x = 55,365,225.98
5. Step 5: Solve for x
   x = 55,365,225.98/11,112.72
6. Step 6: Final answer
   x = 4,982.15