Finding the Fourth Proportional to 8,071.24, 12,103.72 and 3,140.24

Step by Step Solution

1. Step 1: Write the proportion equation
   8,071.24 : 12,103.72 = 3,140.24 : x
2. Step 2: Convert to fraction form
   8,071.24/12,103.72 = 3,140.24/x
3. Step 3: Cross multiply
   8,071.24x = 12,103.72 × 3,140.24
4. Step 4: Simplify right side
   8,071.24x = 38,008,585.69
5. Step 5: Solve for x
   x = 38,008,585.69/8,071.24
6. Step 6: Final answer
   x = 4,709.14