Finding the Fourth Proportional to 10.31, 15.42 and 6.82

Step by Step Solution

1. Step 1: Write the proportion equation
   10.31 : 15.42 = 6.82 : x
2. Step 2: Convert to fraction form
   10.31/15.42 = 6.82/x
3. Step 3: Cross multiply
   10.31x = 15.42 × 6.82
4. Step 4: Simplify right side
   10.31x = 105.22
5. Step 5: Solve for x
   x = 105.22/10.31
6. Step 6: Final answer
   x = 10.21