Finding the Fourth Proportional to 82.74, 124.15 and 42.19

Step by Step Solution

1. Step 1: Write the proportion equation
   82.74 : 124.15 = 42.19 : x
2. Step 2: Convert to fraction form
   82.74/124.15 = 42.19/x
3. Step 3: Cross multiply
   82.74x = 124.15 × 42.19
4. Step 4: Simplify right side
   82.74x = 5,238.10
5. Step 5: Solve for x
   x = 5,238.10/82.74
6. Step 6: Final answer
   x = 63.31