Finding the Fourth Proportional to 82.31, 123.42 and 30.94

Step by Step Solution

1. Step 1: Write the proportion equation
   82.31 : 123.42 = 30.94 : x
2. Step 2: Convert to fraction form
   82.31/123.42 = 30.94/x
3. Step 3: Cross multiply
   82.31x = 123.42 × 30.94
4. Step 4: Simplify right side
   82.31x = 3,818.42
5. Step 5: Solve for x
   x = 3,818.42/82.31
6. Step 6: Final answer
   x = 46.39