Finding the Fourth Proportional to 13,542.18, 18,688.61 and 7,573.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,542.18 : 18,688.61 = 7,573.72 : x
2. Step 2: Convert to fraction form
   13,542.18/18,688.61 = 7,573.72/x
3. Step 3: Cross multiply
   13,542.18x = 18,688.61 × 7,573.72
4. Step 4: Simplify right side
   13,542.18x = 141,542,299.33
5. Step 5: Solve for x
   x = 141,542,299.33/13,542.18
6. Step 6: Final answer
   x = 10,451.96