Finding the Fourth Proportional to 13,540, 18,685.56 and 7,572.68

Step by Step Solution

1. Step 1: Write the proportion equation
   13,540 : 18,685.56 = 7,572.68 : x
2. Step 2: Convert to fraction form
   13,540/18,685.56 = 7,572.68/x
3. Step 3: Cross multiply
   13,540x = 18,685.56 × 7,572.68
4. Step 4: Simplify right side
   13,540x = 141,499,766.50
5. Step 5: Solve for x
   x = 141,499,766.50/13,540
6. Step 6: Final answer
   x = 10,450.50