Finding the Fourth Proportional to 83.19, 124.77 and 42.59

Step by Step Solution

1. Step 1: Write the proportion equation
   83.19 : 124.77 = 42.59 : x
2. Step 2: Convert to fraction form
   83.19/124.77 = 42.59/x
3. Step 3: Cross multiply
   83.19x = 124.77 × 42.59
4. Step 4: Simplify right side
   83.19x = 5,314.43
5. Step 5: Solve for x
   x = 5,314.43/83.19
6. Step 6: Final answer
   x = 63.88