Finding the Fourth Proportional to 13,581.76, 18,743.34 and 7,613.55

Step by Step Solution

1. Step 1: Write the proportion equation
   13,581.76 : 18,743.34 = 7,613.55 : x
2. Step 2: Convert to fraction form
   13,581.76/18,743.34 = 7,613.55/x
3. Step 3: Cross multiply
   13,581.76x = 18,743.34 × 7,613.55
4. Step 4: Simplify right side
   13,581.76x = 142,703,356.26
5. Step 5: Solve for x
   x = 142,703,356.26/13,581.76
6. Step 6: Final answer
   x = 10,506.99