Finding the Fourth Proportional to 12,078.81, 18,120.42 and 3,758.29

Step by Step Solution

1. Step 1: Write the proportion equation
   12,078.81 : 18,120.42 = 3,758.29 : x
2. Step 2: Convert to fraction form
   12,078.81/18,120.42 = 3,758.29/x
3. Step 3: Cross multiply
   12,078.81x = 18,120.42 × 3,758.29
4. Step 4: Simplify right side
   12,078.81x = 68,101,747.98
5. Step 5: Solve for x
   x = 68,101,747.98/12,078.81
6. Step 6: Final answer
   x = 5,638.12