Finding the Fourth Proportional to 8,111.88, 12,162.15 and 4,415.85

Step by Step Solution

1. Step 1: Write the proportion equation
   8,111.88 : 12,162.15 = 4,415.85 : x
2. Step 2: Convert to fraction form
   8,111.88/12,162.15 = 4,415.85/x
3. Step 3: Cross multiply
   8,111.88x = 12,162.15 × 4,415.85
4. Step 4: Simplify right side
   8,111.88x = 53,706,230.08
5. Step 5: Solve for x
   x = 53,706,230.08/8,111.88
6. Step 6: Final answer
   x = 6,620.69