Finding the Fourth Proportional to 12,855.69, 17,709.12 and 10,961.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,855.69 : 17,709.12 = 10,961.10 : x
2. Step 2: Convert to fraction form
   12,855.69/17,709.12 = 10,961.10/x
3. Step 3: Cross multiply
   12,855.69x = 17,709.12 × 10,961.10
4. Step 4: Simplify right side
   12,855.69x = 194,111,435.23
5. Step 5: Solve for x
   x = 194,111,435.23/12,855.69
6. Step 6: Final answer
   x = 15,099.26