Finding the Fourth Proportional to 83.28, 124.98 and 42.69

Step by Step Solution

1. Step 1: Write the proportion equation
   83.28 : 124.98 = 42.69 : x
2. Step 2: Convert to fraction form
   83.28/124.98 = 42.69/x
3. Step 3: Cross multiply
   83.28x = 124.98 × 42.69
4. Step 4: Simplify right side
   83.28x = 5,335.40
5. Step 5: Solve for x
   x = 5,335.40/83.28
6. Step 6: Final answer
   x = 64.07