Finding the Fourth Proportional to 10.72, 14.78 and 7.98

Step by Step Solution

1. Step 1: Write the proportion equation
   10.72 : 14.78 = 7.98 : x
2. Step 2: Convert to fraction form
   10.72/14.78 = 7.98/x
3. Step 3: Cross multiply
   10.72x = 14.78 × 7.98
4. Step 4: Simplify right side
   10.72x = 117.94
5. Step 5: Solve for x
   x = 117.94/10.72
6. Step 6: Final answer
   x = 11.00