Finding the Fourth Proportional to 82.76, 123.92 and 42.06

Step by Step Solution

1. Step 1: Write the proportion equation
   82.76 : 123.92 = 42.06 : x
2. Step 2: Convert to fraction form
   82.76/123.92 = 42.06/x
3. Step 3: Cross multiply
   82.76x = 123.92 × 42.06
4. Step 4: Simplify right side
   82.76x = 5,211.86
5. Step 5: Solve for x
   x = 5,211.86/82.76
6. Step 6: Final answer
   x = 62.97