Finding the Fourth Proportional to 10,785, 16,178.72 and 3,390.52

Step by Step Solution

1. Step 1: Write the proportion equation
   10,785 : 16,178.72 = 3,390.52 : x
2. Step 2: Convert to fraction form
   10,785/16,178.72 = 3,390.52/x
3. Step 3: Cross multiply
   10,785x = 16,178.72 × 3,390.52
4. Step 4: Simplify right side
   10,785x = 54,854,273.73
5. Step 5: Solve for x
   x = 54,854,273.73/10,785
6. Step 6: Final answer
   x = 5,086.16