Finding the Fourth Proportional to 12,884.85, 17,777.04 and 7,218.83

Step by Step Solution

1. Step 1: Write the proportion equation
   12,884.85 : 17,777.04 = 7,218.83 : x
2. Step 2: Convert to fraction form
   12,884.85/17,777.04 = 7,218.83/x
3. Step 3: Cross multiply
   12,884.85x = 17,777.04 × 7,218.83
4. Step 4: Simplify right side
   12,884.85x = 128,329,340.78
5. Step 5: Solve for x
   x = 128,329,340.78/12,884.85
6. Step 6: Final answer
   x = 9,959.71