Finding the Fourth Proportional to 12,191.91, 18,288.49 and 3,872.58

Step by Step Solution

1. Step 1: Write the proportion equation
   12,191.91 : 18,288.49 = 3,872.58 : x
2. Step 2: Convert to fraction form
   12,191.91/18,288.49 = 3,872.58/x
3. Step 3: Cross multiply
   12,191.91x = 18,288.49 × 3,872.58
4. Step 4: Simplify right side
   12,191.91x = 70,823,640.60
5. Step 5: Solve for x
   x = 70,823,640.60/12,191.91
6. Step 6: Final answer
   x = 5,809.07