Finding the Fourth Proportional to 11,111.88, 16,661.34 and 3,318.60

Step by Step Solution

1. Step 1: Write the proportion equation
   11,111.88 : 16,661.34 = 3,318.60 : x
2. Step 2: Convert to fraction form
   11,111.88/16,661.34 = 3,318.60/x
3. Step 3: Cross multiply
   11,111.88x = 16,661.34 × 3,318.60
4. Step 4: Simplify right side
   11,111.88x = 55,292,322.92
5. Step 5: Solve for x
   x = 55,292,322.92/11,111.88
6. Step 6: Final answer
   x = 4,975.96