Finding the Fourth Proportional to 8,072.31, 12,105.40 and 3,141.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,072.31 : 12,105.40 = 3,141.30 : x
2. Step 2: Convert to fraction form
   8,072.31/12,105.40 = 3,141.30/x
3. Step 3: Cross multiply
   8,072.31x = 12,105.40 × 3,141.30
4. Step 4: Simplify right side
   8,072.31x = 38,026,693.02
5. Step 5: Solve for x
   x = 38,026,693.02/8,072.31
6. Step 6: Final answer
   x = 4,710.76