Finding the Fourth Proportional to 12,171.72, 18,258.66 and 3,406.71

Step by Step Solution

1. Step 1: Write the proportion equation
   12,171.72 : 18,258.66 = 3,406.71 : x
2. Step 2: Convert to fraction form
   12,171.72/18,258.66 = 3,406.71/x
3. Step 3: Cross multiply
   12,171.72x = 18,258.66 × 3,406.71
4. Step 4: Simplify right side
   12,171.72x = 62,201,959.61
5. Step 5: Solve for x
   x = 62,201,959.61/12,171.72
6. Step 6: Final answer
   x = 5,110.37