Finding the Fourth Proportional to 13,581.71, 18,742.38 and 7,613.76

Step by Step Solution

1. Step 1: Write the proportion equation
   13,581.71 : 18,742.38 = 7,613.76 : x
2. Step 2: Convert to fraction form
   13,581.71/18,742.38 = 7,613.76/x
3. Step 3: Cross multiply
   13,581.71x = 18,742.38 × 7,613.76
4. Step 4: Simplify right side
   13,581.71x = 142,699,983.15
5. Step 5: Solve for x
   x = 142,699,983.15/13,581.71
6. Step 6: Final answer
   x = 10,506.78