Finding the Fourth Proportional to 12,882.76, 17,777.27 and 7,216.55

Step by Step Solution

1. Step 1: Write the proportion equation
   12,882.76 : 17,777.27 = 7,216.55 : x
2. Step 2: Convert to fraction form
   12,882.76/17,777.27 = 7,216.55/x
3. Step 3: Cross multiply
   12,882.76x = 17,777.27 × 7,216.55
4. Step 4: Simplify right side
   12,882.76x = 128,290,553.64
5. Step 5: Solve for x
   x = 128,290,553.64/12,882.76
6. Step 6: Final answer
   x = 9,958.31