Finding the Fourth Proportional to 11.98, 17.89 and 10.16

Step by Step Solution

1. Step 1: Write the proportion equation
   11.98 : 17.89 = 10.16 : x
2. Step 2: Convert to fraction form
   11.98/17.89 = 10.16/x
3. Step 3: Cross multiply
   11.98x = 17.89 × 10.16
4. Step 4: Simplify right side
   11.98x = 181.71
5. Step 5: Solve for x
   x = 181.71/11.98
6. Step 6: Final answer
   x = 15.17