Finding the Fourth Proportional to 16,861.96, 25,290.72 and 5,174.20

Step by Step Solution

1. Step 1: Write the proportion equation
   16,861.96 : 25,290.72 = 5,174.20 : x
2. Step 2: Convert to fraction form
   16,861.96/25,290.72 = 5,174.20/x
3. Step 3: Cross multiply
   16,861.96x = 25,290.72 × 5,174.20
4. Step 4: Simplify right side
   16,861.96x = 130,859,243.42
5. Step 5: Solve for x
   x = 130,859,243.42/16,861.96
6. Step 6: Final answer
   x = 7,760.62