Finding the Fourth Proportional to 13,005.35, 17,942.55 and 8,531.59

Step by Step Solution

1. Step 1: Write the proportion equation
   13,005.35 : 17,942.55 = 8,531.59 : x
2. Step 2: Convert to fraction form
   13,005.35/17,942.55 = 8,531.59/x
3. Step 3: Cross multiply
   13,005.35x = 17,942.55 × 8,531.59
4. Step 4: Simplify right side
   13,005.35x = 153,078,480.15
5. Step 5: Solve for x
   x = 153,078,480.15/13,005.35
6. Step 6: Final answer
   x = 11,770.42