Finding the Fourth Proportional to 12,685.55, 17,512.17 and 8,443.67

Step by Step Solution

1. Step 1: Write the proportion equation
   12,685.55 : 17,512.17 = 8,443.67 : x
2. Step 2: Convert to fraction form
   12,685.55/17,512.17 = 8,443.67/x
3. Step 3: Cross multiply
   12,685.55x = 17,512.17 × 8,443.67
4. Step 4: Simplify right side
   12,685.55x = 147,866,984.46
5. Step 5: Solve for x
   x = 147,866,984.46/12,685.55
6. Step 6: Final answer
   x = 11,656.33