Finding the Fourth Proportional to 82.74, 123.97 and 42.10

Step by Step Solution

1. Step 1: Write the proportion equation
   82.74 : 123.97 = 42.10 : x
2. Step 2: Convert to fraction form
   82.74/123.97 = 42.10/x
3. Step 3: Cross multiply
   82.74x = 123.97 × 42.10
4. Step 4: Simplify right side
   82.74x = 5,219.14
5. Step 5: Solve for x
   x = 5,219.14/82.74
6. Step 6: Final answer
   x = 63.08