Finding the Fourth Proportional to 9,871.55, 13,613.92 and 8,190.29

Step by Step Solution

1. Step 1: Write the proportion equation
   9,871.55 : 13,613.92 = 8,190.29 : x
2. Step 2: Convert to fraction form
   9,871.55/13,613.92 = 8,190.29/x
3. Step 3: Cross multiply
   9,871.55x = 13,613.92 × 8,190.29
4. Step 4: Simplify right side
   9,871.55x = 111,501,911.89
5. Step 5: Solve for x
   x = 111,501,911.89/9,871.55
6. Step 6: Final answer
   x = 11,295.28