Finding the Fourth Proportional to 9,861.47, 13,608.87 and 5,385.32

Step by Step Solution

1. Step 1: Write the proportion equation
   9,861.47 : 13,608.87 = 5,385.32 : x
2. Step 2: Convert to fraction form
   9,861.47/13,608.87 = 5,385.32/x
3. Step 3: Cross multiply
   9,861.47x = 13,608.87 × 5,385.32
4. Step 4: Simplify right side
   9,861.47x = 73,288,119.79
5. Step 5: Solve for x
   x = 73,288,119.79/9,861.47
6. Step 6: Final answer
   x = 7,431.76