Finding the Fourth Proportional to 12,180.31, 18,270.98 and 3,860.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,180.31 : 18,270.98 = 3,860.15 : x
2. Step 2: Convert to fraction form
   12,180.31/18,270.98 = 3,860.15/x
3. Step 3: Cross multiply
   12,180.31x = 18,270.98 × 3,860.15
4. Step 4: Simplify right side
   12,180.31x = 70,528,723.45
5. Step 5: Solve for x
   x = 70,528,723.45/12,180.31
6. Step 6: Final answer
   x = 5,790.39