Finding the Fourth Proportional to 12,373.50, 17,078.16 and 9,679.38

Step by Step Solution

1. Step 1: Write the proportion equation
   12,373.50 : 17,078.16 = 9,679.38 : x
2. Step 2: Convert to fraction form
   12,373.50/17,078.16 = 9,679.38/x
3. Step 3: Cross multiply
   12,373.50x = 17,078.16 × 9,679.38
4. Step 4: Simplify right side
   12,373.50x = 165,306,000.34
5. Step 5: Solve for x
   x = 165,306,000.34/12,373.50
6. Step 6: Final answer
   x = 13,359.68