Finding the Fourth Proportional to 53.42, 80.18 and 42.04

Step by Step Solution

1. Step 1: Write the proportion equation
   53.42 : 80.18 = 42.04 : x
2. Step 2: Convert to fraction form
   53.42/80.18 = 42.04/x
3. Step 3: Cross multiply
   53.42x = 80.18 × 42.04
4. Step 4: Simplify right side
   53.42x = 3,370.77
5. Step 5: Solve for x
   x = 3,370.77/53.42
6. Step 6: Final answer
   x = 63.10