Finding the Fourth Proportional to 85.82, 118.31 and 71.82

Step by Step Solution

1. Step 1: Write the proportion equation
   85.82 : 118.31 = 71.82 : x
2. Step 2: Convert to fraction form
   85.82/118.31 = 71.82/x
3. Step 3: Cross multiply
   85.82x = 118.31 × 71.82
4. Step 4: Simplify right side
   85.82x = 8,496.67
5. Step 5: Solve for x
   x = 8,496.67/85.82
6. Step 6: Final answer
   x = 99.01