Finding the Fourth Proportional to 8,123.15, 12,187.20 and 3,440.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,123.15 : 12,187.20 = 3,440.72 : x
2. Step 2: Convert to fraction form
   8,123.15/12,187.20 = 3,440.72/x
3. Step 3: Cross multiply
   8,123.15x = 12,187.20 × 3,440.72
4. Step 4: Simplify right side
   8,123.15x = 41,932,742.78
5. Step 5: Solve for x
   x = 41,932,742.78/8,123.15
6. Step 6: Final answer
   x = 5,162.13