Finding the Fourth Proportional to 13,591.56, 18,756.31 and 7,542.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,591.56 : 18,756.31 = 7,542.72 : x
2. Step 2: Convert to fraction form
   13,591.56/18,756.31 = 7,542.72/x
3. Step 3: Cross multiply
   13,591.56x = 18,756.31 × 7,542.72
4. Step 4: Simplify right side
   13,591.56x = 141,473,594.56
5. Step 5: Solve for x
   x = 141,473,594.56/13,591.56
6. Step 6: Final answer
   x = 10,408.93