Finding the Fourth Proportional to 82.69, 124.09 and 42.10

Step by Step Solution

1. Step 1: Write the proportion equation
   82.69 : 124.09 = 42.10 : x
2. Step 2: Convert to fraction form
   82.69/124.09 = 42.10/x
3. Step 3: Cross multiply
   82.69x = 124.09 × 42.10
4. Step 4: Simplify right side
   82.69x = 5,224.71
5. Step 5: Solve for x
   x = 5,224.71/82.69
6. Step 6: Final answer
   x = 63.19