Finding the Fourth Proportional to 13,821.72, 19,078.16 and 13,116.48

Step by Step Solution

1. Step 1: Write the proportion equation
   13,821.72 : 19,078.16 = 13,116.48 : x
2. Step 2: Convert to fraction form
   13,821.72/19,078.16 = 13,116.48/x
3. Step 3: Cross multiply
   13,821.72x = 19,078.16 × 13,116.48
4. Step 4: Simplify right side
   13,821.72x = 250,238,304.08
5. Step 5: Solve for x
   x = 250,238,304.08/13,821.72
6. Step 6: Final answer
   x = 18,104.72