Finding the Fourth Proportional to 7,141.50, 9,855.28 and 3,997.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,141.50 : 9,855.28 = 3,997.72 : x
2. Step 2: Convert to fraction form
   7,141.50/9,855.28 = 3,997.72/x
3. Step 3: Cross multiply
   7,141.50x = 9,855.28 × 3,997.72
4. Step 4: Simplify right side
   7,141.50x = 39,398,649.96
5. Step 5: Solve for x
   x = 39,398,649.96/7,141.50
6. Step 6: Final answer
   x = 5,516.86