Finding the Fourth Proportional to 11,911.78, 17,867.94 and 4,519.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,911.78 : 17,867.94 = 4,519.72 : x
2. Step 2: Convert to fraction form
   11,911.78/17,867.94 = 4,519.72/x
3. Step 3: Cross multiply
   11,911.78x = 17,867.94 × 4,519.72
4. Step 4: Simplify right side
   11,911.78x = 80,758,085.78
5. Step 5: Solve for x
   x = 80,758,085.78/11,911.78
6. Step 6: Final answer
   x = 6,779.68