Finding the Fourth Proportional to 9,865.72, 13,617.12 and 5,889.34

Step by Step Solution

1. Step 1: Write the proportion equation
   9,865.72 : 13,617.12 = 5,889.34 : x
2. Step 2: Convert to fraction form
   9,865.72/13,617.12 = 5,889.34/x
3. Step 3: Cross multiply
   9,865.72x = 13,617.12 × 5,889.34
4. Step 4: Simplify right side
   9,865.72x = 80,195,849.50
5. Step 5: Solve for x
   x = 80,195,849.50/9,865.72
6. Step 6: Final answer
   x = 8,128.74