Finding the Fourth Proportional to 163.89, 245.83 and 42.15

Step by Step Solution

1. Step 1: Write the proportion equation
   163.89 : 245.83 = 42.15 : x
2. Step 2: Convert to fraction form
   163.89/245.83 = 42.15/x
3. Step 3: Cross multiply
   163.89x = 245.83 × 42.15
4. Step 4: Simplify right side
   163.89x = 10,361.73
5. Step 5: Solve for x
   x = 10,361.73/163.89
6. Step 6: Final answer
   x = 63.23