Finding the Fourth Proportional to 13,587.24, 18,751.09 and 7,618.55

Step by Step Solution

1. Step 1: Write the proportion equation
   13,587.24 : 18,751.09 = 7,618.55 : x
2. Step 2: Convert to fraction form
   13,587.24/18,751.09 = 7,618.55/x
3. Step 3: Cross multiply
   13,587.24x = 18,751.09 × 7,618.55
4. Step 4: Simplify right side
   13,587.24x = 142,856,144.55
5. Step 5: Solve for x
   x = 142,856,144.55/13,587.24
6. Step 6: Final answer
   x = 10,513.99