Finding the Fourth Proportional to 11,405.69, 17,109.20 and 10,785.12

Step by Step Solution

1. Step 1: Write the proportion equation
   11,405.69 : 17,109.20 = 10,785.12 : x
2. Step 2: Convert to fraction form
   11,405.69/17,109.20 = 10,785.12/x
3. Step 3: Cross multiply
   11,405.69x = 17,109.20 × 10,785.12
4. Step 4: Simplify right side
   11,405.69x = 184,524,775.10
5. Step 5: Solve for x
   x = 184,524,775.10/11,405.69
6. Step 6: Final answer
   x = 16,178.31