Finding the Fourth Proportional to 83.19, 124.67 and 42.53

Step by Step Solution

1. Step 1: Write the proportion equation
   83.19 : 124.67 = 42.53 : x
2. Step 2: Convert to fraction form
   83.19/124.67 = 42.53/x
3. Step 3: Cross multiply
   83.19x = 124.67 × 42.53
4. Step 4: Simplify right side
   83.19x = 5,301.57
5. Step 5: Solve for x
   x = 5,301.57/83.19
6. Step 6: Final answer
   x = 63.73