Finding the Fourth Proportional to 82.15, 123.12 and 45.97

Step by Step Solution

1. Step 1: Write the proportion equation
   82.15 : 123.12 = 45.97 : x
2. Step 2: Convert to fraction form
   82.15/123.12 = 45.97/x
3. Step 3: Cross multiply
   82.15x = 123.12 × 45.97
4. Step 4: Simplify right side
   82.15x = 5,659.52
5. Step 5: Solve for x
   x = 5,659.52/82.15
6. Step 6: Final answer
   x = 68.89