Finding the Fourth Proportional to 12,100.82, 18,143.43 and 5,085.38

Step by Step Solution

1. Step 1: Write the proportion equation
   12,100.82 : 18,143.43 = 5,085.38 : x
2. Step 2: Convert to fraction form
   12,100.82/18,143.43 = 5,085.38/x
3. Step 3: Cross multiply
   12,100.82x = 18,143.43 × 5,085.38
4. Step 4: Simplify right side
   12,100.82x = 92,266,236.05
5. Step 5: Solve for x
   x = 92,266,236.05/12,100.82
6. Step 6: Final answer
   x = 7,624.79