Finding the Fourth Proportional to 11,811.91, 16,290.73 and 8,621.62

Step by Step Solution

1. Step 1: Write the proportion equation
   11,811.91 : 16,290.73 = 8,621.62 : x
2. Step 2: Convert to fraction form
   11,811.91/16,290.73 = 8,621.62/x
3. Step 3: Cross multiply
   11,811.91x = 16,290.73 × 8,621.62
4. Step 4: Simplify right side
   11,811.91x = 140,452,483.58
5. Step 5: Solve for x
   x = 140,452,483.58/11,811.91
6. Step 6: Final answer
   x = 11,890.75