Finding the Fourth Proportional to 12,881.72, 17,775.24 and 7,216.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,881.72 : 17,775.24 = 7,216.76 : x
2. Step 2: Convert to fraction form
   12,881.72/17,775.24 = 7,216.76/x
3. Step 3: Cross multiply
   12,881.72x = 17,775.24 × 7,216.76
4. Step 4: Simplify right side
   12,881.72x = 128,279,641.02
5. Step 5: Solve for x
   x = 128,279,641.02/12,881.72
6. Step 6: Final answer
   x = 9,958.27