Finding the Fourth Proportional to 12,443.10, 18,668.28 and 3,678.06

Step by Step Solution

1. Step 1: Write the proportion equation
   12,443.10 : 18,668.28 = 3,678.06 : x
2. Step 2: Convert to fraction form
   12,443.10/18,668.28 = 3,678.06/x
3. Step 3: Cross multiply
   12,443.10x = 18,668.28 × 3,678.06
4. Step 4: Simplify right side
   12,443.10x = 68,663,053.94
5. Step 5: Solve for x
   x = 68,663,053.94/12,443.10
6. Step 6: Final answer
   x = 5,518.16