Finding the Fourth Proportional to 8,071.30, 12,104.55 and 3,138.10

Step by Step Solution

1. Step 1: Write the proportion equation
   8,071.30 : 12,104.55 = 3,138.10 : x
2. Step 2: Convert to fraction form
   8,071.30/12,104.55 = 3,138.10/x
3. Step 3: Cross multiply
   8,071.30x = 12,104.55 × 3,138.10
4. Step 4: Simplify right side
   8,071.30x = 37,985,288.36
5. Step 5: Solve for x
   x = 37,985,288.36/8,071.30
6. Step 6: Final answer
   x = 4,706.22