Finding the Fourth Proportional to 11,519.86, 17,256.85 and 8,878.15

Step by Step Solution

1. Step 1: Write the proportion equation
   11,519.86 : 17,256.85 = 8,878.15 : x
2. Step 2: Convert to fraction form
   11,519.86/17,256.85 = 8,878.15/x
3. Step 3: Cross multiply
   11,519.86x = 17,256.85 × 8,878.15
4. Step 4: Simplify right side
   11,519.86x = 153,208,902.83
5. Step 5: Solve for x
   x = 153,208,902.83/11,519.86
6. Step 6: Final answer
   x = 13,299.55