Finding the Fourth Proportional to 8,111.55, 12,170.49 and 3,180.33

Step by Step Solution

1. Step 1: Write the proportion equation
   8,111.55 : 12,170.49 = 3,180.33 : x
2. Step 2: Convert to fraction form
   8,111.55/12,170.49 = 3,180.33/x
3. Step 3: Cross multiply
   8,111.55x = 12,170.49 × 3,180.33
4. Step 4: Simplify right side
   8,111.55x = 38,706,174.46
5. Step 5: Solve for x
   x = 38,706,174.46/8,111.55
6. Step 6: Final answer
   x = 4,771.74