Finding the Fourth Proportional to 11,679.82, 17,521.71 and 5,105.86

Step by Step Solution

1. Step 1: Write the proportion equation
   11,679.82 : 17,521.71 = 5,105.86 : x
2. Step 2: Convert to fraction form
   11,679.82/17,521.71 = 5,105.86/x
3. Step 3: Cross multiply
   11,679.82x = 17,521.71 × 5,105.86
4. Step 4: Simplify right side
   11,679.82x = 89,463,398.22
5. Step 5: Solve for x
   x = 89,463,398.22/11,679.82
6. Step 6: Final answer
   x = 7,659.66