Finding the Fourth Proportional to 9,861.72, 13,608.94 and 5,385.24

Step by Step Solution

1. Step 1: Write the proportion equation
   9,861.72 : 13,608.94 = 5,385.24 : x
2. Step 2: Convert to fraction form
   9,861.72/13,608.94 = 5,385.24/x
3. Step 3: Cross multiply
   9,861.72x = 13,608.94 × 5,385.24
4. Step 4: Simplify right side
   9,861.72x = 73,287,408.05
5. Step 5: Solve for x
   x = 73,287,408.05/9,861.72
6. Step 6: Final answer
   x = 7,431.50