Finding the Fourth Proportional to 68.27, 102.50 and 42.50

Step by Step Solution

1. Step 1: Write the proportion equation
   68.27 : 102.50 = 42.50 : x
2. Step 2: Convert to fraction form
   68.27/102.50 = 42.50/x
3. Step 3: Cross multiply
   68.27x = 102.50 × 42.50
4. Step 4: Simplify right side
   68.27x = 4,355.53
5. Step 5: Solve for x
   x = 4,355.53/68.27
6. Step 6: Final answer
   x = 63.80