Finding the Fourth Proportional to 53.02, 73.18 and 42.18

Step by Step Solution

1. Step 1: Write the proportion equation
   53.02 : 73.18 = 42.18 : x
2. Step 2: Convert to fraction form
   53.02/73.18 = 42.18/x
3. Step 3: Cross multiply
   53.02x = 73.18 × 42.18
4. Step 4: Simplify right side
   53.02x = 3,086.73
5. Step 5: Solve for x
   x = 3,086.73/53.02
6. Step 6: Final answer
   x = 58.22