Finding the Fourth Proportional to 13,581.56, 18,742.43 and 7,613.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,581.56 : 18,742.43 = 7,613.28 : x
2. Step 2: Convert to fraction form
   13,581.56/18,742.43 = 7,613.28/x
3. Step 3: Cross multiply
   13,581.56x = 18,742.43 × 7,613.28
4. Step 4: Simplify right side
   13,581.56x = 142,691,329.40
5. Step 5: Solve for x
   x = 142,691,329.40/13,581.56
6. Step 6: Final answer
   x = 10,506.26