Finding the Fourth Proportional to 12,756, 17,604.72 and 7,168.80

Step by Step Solution

1. Step 1: Write the proportion equation
   12,756 : 17,604.72 = 7,168.80 : x
2. Step 2: Convert to fraction form
   12,756/17,604.72 = 7,168.80/x
3. Step 3: Cross multiply
   12,756x = 17,604.72 × 7,168.80
4. Step 4: Simplify right side
   12,756x = 126,204,716.74
5. Step 5: Solve for x
   x = 126,204,716.74/12,756
6. Step 6: Final answer
   x = 9,893.75