Finding the Fourth Proportional to 8,667.72, 13,000.14 and 3,120.03

Step by Step Solution

1. Step 1: Write the proportion equation
   8,667.72 : 13,000.14 = 3,120.03 : x
2. Step 2: Convert to fraction form
   8,667.72/13,000.14 = 3,120.03/x
3. Step 3: Cross multiply
   8,667.72x = 13,000.14 × 3,120.03
4. Step 4: Simplify right side
   8,667.72x = 40,560,826.80
5. Step 5: Solve for x
   x = 40,560,826.80/8,667.72
6. Step 6: Final answer
   x = 4,679.53