Finding the Fourth Proportional to 11,818.72, 17,724.18 and 3,919.42

Step by Step Solution

1. Step 1: Write the proportion equation
   11,818.72 : 17,724.18 = 3,919.42 : x
2. Step 2: Convert to fraction form
   11,818.72/17,724.18 = 3,919.42/x
3. Step 3: Cross multiply
   11,818.72x = 17,724.18 × 3,919.42
4. Step 4: Simplify right side
   11,818.72x = 69,468,505.58
5. Step 5: Solve for x
   x = 69,468,505.58/11,818.72
6. Step 6: Final answer
   x = 5,877.84