Finding the Fourth Proportional to 53.22, 79.98 and 42.42

Step by Step Solution

1. Step 1: Write the proportion equation
   53.22 : 79.98 = 42.42 : x
2. Step 2: Convert to fraction form
   53.22/79.98 = 42.42/x
3. Step 3: Cross multiply
   53.22x = 79.98 × 42.42
4. Step 4: Simplify right side
   53.22x = 3,392.75
5. Step 5: Solve for x
   x = 3,392.75/53.22
6. Step 6: Final answer
   x = 63.75