Finding the Fourth Proportional to 11,573.30, 17,321.55 and 8,117.30

Step by Step Solution

1. Step 1: Write the proportion equation
   11,573.30 : 17,321.55 = 8,117.30 : x
2. Step 2: Convert to fraction form
   11,573.30/17,321.55 = 8,117.30/x
3. Step 3: Cross multiply
   11,573.30x = 17,321.55 × 8,117.30
4. Step 4: Simplify right side
   11,573.30x = 140,604,217.82
5. Step 5: Solve for x
   x = 140,604,217.82/11,573.30
6. Step 6: Final answer
   x = 12,149.02