Finding the Fourth Proportional to 13,105.71, 18,085.98 and 7,137.41

Step by Step Solution

1. Step 1: Write the proportion equation
   13,105.71 : 18,085.98 = 7,137.41 : x
2. Step 2: Convert to fraction form
   13,105.71/18,085.98 = 7,137.41/x
3. Step 3: Cross multiply
   13,105.71x = 18,085.98 × 7,137.41
4. Step 4: Simplify right side
   13,105.71x = 129,086,964.08
5. Step 5: Solve for x
   x = 129,086,964.08/13,105.71
6. Step 6: Final answer
   x = 9,849.67