Finding the Fourth Proportional to 11,888.16, 16,403.24 and 7,172.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,888.16 : 16,403.24 = 7,172.72 : x
2. Step 2: Convert to fraction form
   11,888.16/16,403.24 = 7,172.72/x
3. Step 3: Cross multiply
   11,888.16x = 16,403.24 × 7,172.72
4. Step 4: Simplify right side
   11,888.16x = 117,655,847.61
5. Step 5: Solve for x
   x = 117,655,847.61/11,888.16
6. Step 6: Final answer
   x = 9,896.89