Finding the Fourth Proportional to 8,071.21, 12,104.45 and 3,139.67

Step by Step Solution

1. Step 1: Write the proportion equation
   8,071.21 : 12,104.45 = 3,139.67 : x
2. Step 2: Convert to fraction form
   8,071.21/12,104.45 = 3,139.67/x
3. Step 3: Cross multiply
   8,071.21x = 12,104.45 × 3,139.67
4. Step 4: Simplify right side
   8,071.21x = 38,003,962.83
5. Step 5: Solve for x
   x = 38,003,962.83/8,071.21
6. Step 6: Final answer
   x = 4,708.59