Finding the Fourth Proportional to 83.23, 124.78 and 42.10

Step by Step Solution

1. Step 1: Write the proportion equation
   83.23 : 124.78 = 42.10 : x
2. Step 2: Convert to fraction form
   83.23/124.78 = 42.10/x
3. Step 3: Cross multiply
   83.23x = 124.78 × 42.10
4. Step 4: Simplify right side
   83.23x = 5,253.24
5. Step 5: Solve for x
   x = 5,253.24/83.23
6. Step 6: Final answer
   x = 63.12