Finding the Fourth Proportional to 8,131.72, 11,221.98 and 4,986.04

Step by Step Solution

1. Step 1: Write the proportion equation
   8,131.72 : 11,221.98 = 4,986.04 : x
2. Step 2: Convert to fraction form
   8,131.72/11,221.98 = 4,986.04/x
3. Step 3: Cross multiply
   8,131.72x = 11,221.98 × 4,986.04
4. Step 4: Simplify right side
   8,131.72x = 55,953,241.16
5. Step 5: Solve for x
   x = 55,953,241.16/8,131.72
6. Step 6: Final answer
   x = 6,880.86