Finding the Fourth Proportional to 13,581.60, 18,742.17 and 7,613.61

Step by Step Solution

1. Step 1: Write the proportion equation
   13,581.60 : 18,742.17 = 7,613.61 : x
2. Step 2: Convert to fraction form
   13,581.60/18,742.17 = 7,613.61/x
3. Step 3: Cross multiply
   13,581.60x = 18,742.17 × 7,613.61
4. Step 4: Simplify right side
   13,581.60x = 142,695,572.93
5. Step 5: Solve for x
   x = 142,695,572.93/13,581.60
6. Step 6: Final answer
   x = 10,506.54