Finding the Fourth Proportional to 83.18, 124.70 and 42.51

Step by Step Solution

1. Step 1: Write the proportion equation
   83.18 : 124.70 = 42.51 : x
2. Step 2: Convert to fraction form
   83.18/124.70 = 42.51/x
3. Step 3: Cross multiply
   83.18x = 124.70 × 42.51
4. Step 4: Simplify right side
   83.18x = 5,301.25
5. Step 5: Solve for x
   x = 5,301.25/83.18
6. Step 6: Final answer
   x = 63.73