Finding the Fourth Proportional to 10.78, 16.18 and 10.18

Step by Step Solution

1. Step 1: Write the proportion equation
   10.78 : 16.18 = 10.18 : x
2. Step 2: Convert to fraction form
   10.78/16.18 = 10.18/x
3. Step 3: Cross multiply
   10.78x = 16.18 × 10.18
4. Step 4: Simplify right side
   10.78x = 164.71
5. Step 5: Solve for x
   x = 164.71/10.78
6. Step 6: Final answer
   x = 15.28