Finding the Fourth Proportional to 12,215.41, 16,856.31 and 7,179.82

Step by Step Solution

1. Step 1: Write the proportion equation
   12,215.41 : 16,856.31 = 7,179.82 : x
2. Step 2: Convert to fraction form
   12,215.41/16,856.31 = 7,179.82/x
3. Step 3: Cross multiply
   12,215.41x = 16,856.31 × 7,179.82
4. Step 4: Simplify right side
   12,215.41x = 121,025,271.66
5. Step 5: Solve for x
   x = 121,025,271.66/12,215.41
6. Step 6: Final answer
   x = 9,907.59