Finding the Fourth Proportional to 12,776.16, 17,629.68 and 7,186.08

Step by Step Solution

1. Step 1: Write the proportion equation
   12,776.16 : 17,629.68 = 7,186.08 : x
2. Step 2: Convert to fraction form
   12,776.16/17,629.68 = 7,186.08/x
3. Step 3: Cross multiply
   12,776.16x = 17,629.68 × 7,186.08
4. Step 4: Simplify right side
   12,776.16x = 126,688,290.85
5. Step 5: Solve for x
   x = 126,688,290.85/12,776.16
6. Step 6: Final answer
   x = 9,915.99