Finding the Fourth Proportional to 7,172.72, 9,897.27 and 4,028.30

Step by Step Solution

1. Step 1: Write the proportion equation
   7,172.72 : 9,897.27 = 4,028.30 : x
2. Step 2: Convert to fraction form
   7,172.72/9,897.27 = 4,028.30/x
3. Step 3: Cross multiply
   7,172.72x = 9,897.27 × 4,028.30
4. Step 4: Simplify right side
   7,172.72x = 39,869,123.25
5. Step 5: Solve for x
   x = 39,869,123.25/7,172.72
6. Step 6: Final answer
   x = 5,558.44