Finding the Fourth Proportional to 12,191.09, 18,287.27 and 3,871.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,191.09 : 18,287.27 = 3,871.76 : x
2. Step 2: Convert to fraction form
   12,191.09/18,287.27 = 3,871.76/x
3. Step 3: Cross multiply
   12,191.09x = 18,287.27 × 3,871.76
4. Step 4: Simplify right side
   12,191.09x = 70,803,809.70
5. Step 5: Solve for x
   x = 70,803,809.70/12,191.09
6. Step 6: Final answer
   x = 5,807.83