Finding the Fourth Proportional to 82.42, 123.64 and 34.31

Step by Step Solution

1. Step 1: Write the proportion equation
   82.42 : 123.64 = 34.31 : x
2. Step 2: Convert to fraction form
   82.42/123.64 = 34.31/x
3. Step 3: Cross multiply
   82.42x = 123.64 × 34.31
4. Step 4: Simplify right side
   82.42x = 4,242.31
5. Step 5: Solve for x
   x = 4,242.31/82.42
6. Step 6: Final answer
   x = 51.47