Finding the Fourth Proportional to 12,776.76, 17,631.72 and 7,187.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,776.76 : 17,631.72 = 7,187.76 : x
2. Step 2: Convert to fraction form
   12,776.76/17,631.72 = 7,187.76/x
3. Step 3: Cross multiply
   12,776.76x = 17,631.72 × 7,187.76
4. Step 4: Simplify right side
   12,776.76x = 126,732,571.75
5. Step 5: Solve for x
   x = 126,732,571.75/12,776.76
6. Step 6: Final answer
   x = 9,918.99