Finding the Fourth Proportional to 12,776.43, 17,631.81 and 7,111.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,776.43 : 17,631.81 = 7,111.56 : x
2. Step 2: Convert to fraction form
   12,776.43/17,631.81 = 7,111.56/x
3. Step 3: Cross multiply
   12,776.43x = 17,631.81 × 7,111.56
4. Step 4: Simplify right side
   12,776.43x = 125,389,674.72
5. Step 5: Solve for x
   x = 125,389,674.72/12,776.43
6. Step 6: Final answer
   x = 9,814.14