Finding the Fourth Proportional to 11,172.24, 15,427.98 and 7,200.18

Step by Step Solution

1. Step 1: Write the proportion equation
   11,172.24 : 15,427.98 = 7,200.18 : x
2. Step 2: Convert to fraction form
   11,172.24/15,427.98 = 7,200.18/x
3. Step 3: Cross multiply
   11,172.24x = 15,427.98 × 7,200.18
4. Step 4: Simplify right side
   11,172.24x = 111,084,233.04
5. Step 5: Solve for x
   x = 111,084,233.04/11,172.24
6. Step 6: Final answer
   x = 9,942.88