Finding the Fourth Proportional to 12,820.75, 17,676.43 and 10,904.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,820.75 : 17,676.43 = 10,904.69 : x
2. Step 2: Convert to fraction form
   12,820.75/17,676.43 = 10,904.69/x
3. Step 3: Cross multiply
   12,820.75x = 17,676.43 × 10,904.69
4. Step 4: Simplify right side
   12,820.75x = 192,756,006.39
5. Step 5: Solve for x
   x = 192,756,006.39/12,820.75
6. Step 6: Final answer
   x = 15,034.69