Finding the Fourth Proportional to 12,086.28, 18,128.07 and 3,766.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,086.28 : 18,128.07 = 3,766.57 : x
2. Step 2: Convert to fraction form
   12,086.28/18,128.07 = 3,766.57/x
3. Step 3: Cross multiply
   12,086.28x = 18,128.07 × 3,766.57
4. Step 4: Simplify right side
   12,086.28x = 68,280,599.30
5. Step 5: Solve for x
   x = 68,280,599.30/12,086.28
6. Step 6: Final answer
   x = 5,649.43