Finding the Fourth Proportional to 123.35, 184.96 and 42.15

Step by Step Solution

1. Step 1: Write the proportion equation
   123.35 : 184.96 = 42.15 : x
2. Step 2: Convert to fraction form
   123.35/184.96 = 42.15/x
3. Step 3: Cross multiply
   123.35x = 184.96 × 42.15
4. Step 4: Simplify right side
   123.35x = 7,795.85
5. Step 5: Solve for x
   x = 7,795.85/123.35
6. Step 6: Final answer
   x = 63.20