Finding the Fourth Proportional to 10,785.98, 16,178.52 and 3,390.28

Step by Step Solution

1. Step 1: Write the proportion equation
   10,785.98 : 16,178.52 = 3,390.28 : x
2. Step 2: Convert to fraction form
   10,785.98/16,178.52 = 3,390.28/x
3. Step 3: Cross multiply
   10,785.98x = 16,178.52 × 3,390.28
4. Step 4: Simplify right side
   10,785.98x = 54,849,614.94
5. Step 5: Solve for x
   x = 54,849,614.94/10,785.98
6. Step 6: Final answer
   x = 5,085.27