Finding the Fourth Proportional to 11,145.39, 16,723.60 and 5,222.71

Step by Step Solution

1. Step 1: Write the proportion equation
   11,145.39 : 16,723.60 = 5,222.71 : x
2. Step 2: Convert to fraction form
   11,145.39/16,723.60 = 5,222.71/x
3. Step 3: Cross multiply
   11,145.39x = 16,723.60 × 5,222.71
4. Step 4: Simplify right side
   11,145.39x = 87,342,429.34
5. Step 5: Solve for x
   x = 87,342,429.34/11,145.39
6. Step 6: Final answer
   x = 7,836.64