Finding the Fourth Proportional to 13,417.78, 18,513.72 and 8,111.56

Step by Step Solution

1. Step 1: Write the proportion equation
   13,417.78 : 18,513.72 = 8,111.56 : x
2. Step 2: Convert to fraction form
   13,417.78/18,513.72 = 8,111.56/x
3. Step 3: Cross multiply
   13,417.78x = 18,513.72 × 8,111.56
4. Step 4: Simplify right side
   13,417.78x = 150,175,150.60
5. Step 5: Solve for x
   x = 150,175,150.60/13,417.78
6. Step 6: Final answer
   x = 11,192.25