Finding the Fourth Proportional to 8,123.10, 12,179.70 and 3,186.83

Step by Step Solution

1. Step 1: Write the proportion equation
   8,123.10 : 12,179.70 = 3,186.83 : x
2. Step 2: Convert to fraction form
   8,123.10/12,179.70 = 3,186.83/x
3. Step 3: Cross multiply
   8,123.10x = 12,179.70 × 3,186.83
4. Step 4: Simplify right side
   8,123.10x = 38,814,572.45
5. Step 5: Solve for x
   x = 38,814,572.45/8,123.10
6. Step 6: Final answer
   x = 4,778.30