Finding the Fourth Proportional to 11,424.07, 15,768.37 and 7,172.18

Step by Step Solution

1. Step 1: Write the proportion equation
   11,424.07 : 15,768.37 = 7,172.18 : x
2. Step 2: Convert to fraction form
   11,424.07/15,768.37 = 7,172.18/x
3. Step 3: Cross multiply
   11,424.07x = 15,768.37 × 7,172.18
4. Step 4: Simplify right side
   11,424.07x = 113,093,577.20
5. Step 5: Solve for x
   x = 113,093,577.20/11,424.07
6. Step 6: Final answer
   x = 9,899.59