Finding the Fourth Proportional to 12,191.28, 18,287.55 and 3,871.95

Step by Step Solution

1. Step 1: Write the proportion equation
   12,191.28 : 18,287.55 = 3,871.95 : x
2. Step 2: Convert to fraction form
   12,191.28/18,287.55 = 3,871.95/x
3. Step 3: Cross multiply
   12,191.28x = 18,287.55 × 3,871.95
4. Step 4: Simplify right side
   12,191.28x = 70,808,479.22
5. Step 5: Solve for x
   x = 70,808,479.22/12,191.28
6. Step 6: Final answer
   x = 5,808.13