Finding the Fourth Proportional to 11,902.20, 16,419.78 and 8,367.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,902.20 : 16,419.78 = 8,367.72 : x
2. Step 2: Convert to fraction form
   11,902.20/16,419.78 = 8,367.72/x
3. Step 3: Cross multiply
   11,902.20x = 16,419.78 × 8,367.72
4. Step 4: Simplify right side
   11,902.20x = 137,396,121.50
5. Step 5: Solve for x
   x = 137,396,121.50/11,902.20
6. Step 6: Final answer
   x = 11,543.76