Finding the Fourth Proportional to 8,667.72, 11,961.24 and 5,131

Step by Step Solution

1. Step 1: Write the proportion equation
   8,667.72 : 11,961.24 = 5,131 : x
2. Step 2: Convert to fraction form
   8,667.72/11,961.24 = 5,131/x
3. Step 3: Cross multiply
   8,667.72x = 11,961.24 × 5,131
4. Step 4: Simplify right side
   8,667.72x = 61,373,122.44
5. Step 5: Solve for x
   x = 61,373,122.44/8,667.72
6. Step 6: Final answer
   x = 7,080.65