Finding the Fourth Proportional to 8,111.76, 12,162.12 and 3,178.32

Step by Step Solution

1. Step 1: Write the proportion equation
   8,111.76 : 12,162.12 = 3,178.32 : x
2. Step 2: Convert to fraction form
   8,111.76/12,162.12 = 3,178.32/x
3. Step 3: Cross multiply
   8,111.76x = 12,162.12 × 3,178.32
4. Step 4: Simplify right side
   8,111.76x = 38,655,109.24
5. Step 5: Solve for x
   x = 38,655,109.24/8,111.76
6. Step 6: Final answer
   x = 4,765.32