Finding the Fourth Proportional to 95.31, 142.16 and 85.82

Step by Step Solution

1. Step 1: Write the proportion equation
   95.31 : 142.16 = 85.82 : x
2. Step 2: Convert to fraction form
   95.31/142.16 = 85.82/x
3. Step 3: Cross multiply
   95.31x = 142.16 × 85.82
4. Step 4: Simplify right side
   95.31x = 12,199.03
5. Step 5: Solve for x
   x = 12,199.03/95.31
6. Step 6: Final answer
   x = 127.99