Finding the Fourth Proportional to 13,581.88, 18,742.59 and 7,613.80

Step by Step Solution

1. Step 1: Write the proportion equation
   13,581.88 : 18,742.59 = 7,613.80 : x
2. Step 2: Convert to fraction form
   13,581.88/18,742.59 = 7,613.80/x
3. Step 3: Cross multiply
   13,581.88x = 18,742.59 × 7,613.80
4. Step 4: Simplify right side
   13,581.88x = 142,702,284.89
5. Step 5: Solve for x
   x = 142,702,284.89/13,581.88
6. Step 6: Final answer
   x = 10,506.82