Finding the Fourth Proportional to 10,815.15, 16,222.62 and 3,419.61

Step by Step Solution

1. Step 1: Write the proportion equation
   10,815.15 : 16,222.62 = 3,419.61 : x
2. Step 2: Convert to fraction form
   10,815.15/16,222.62 = 3,419.61/x
3. Step 3: Cross multiply
   10,815.15x = 16,222.62 × 3,419.61
4. Step 4: Simplify right side
   10,815.15x = 55,475,046.40
5. Step 5: Solve for x
   x = 55,475,046.40/10,815.15
6. Step 6: Final answer
   x = 5,129.38