Finding the Fourth Proportional to 12,776.88, 17,632.56 and 7,111.92

Step by Step Solution

1. Step 1: Write the proportion equation
   12,776.88 : 17,632.56 = 7,111.92 : x
2. Step 2: Convert to fraction form
   12,776.88/17,632.56 = 7,111.92/x
3. Step 3: Cross multiply
   12,776.88x = 17,632.56 × 7,111.92
4. Step 4: Simplify right side
   12,776.88x = 125,401,356.12
5. Step 5: Solve for x
   x = 125,401,356.12/12,776.88
6. Step 6: Final answer
   x = 9,814.71