Finding the Fourth Proportional to 12,881.52, 17,777.62 and 7,216.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,881.52 : 17,777.62 = 7,216.18 : x
2. Step 2: Convert to fraction form
   12,881.52/17,777.62 = 7,216.18/x
3. Step 3: Cross multiply
   12,881.52x = 17,777.62 × 7,216.18
4. Step 4: Simplify right side
   12,881.52x = 128,286,505.89
5. Step 5: Solve for x
   x = 128,286,505.89/12,881.52
6. Step 6: Final answer
   x = 9,958.96