Finding the Fourth Proportional to 69.42, 103.96 and 53.15

Step by Step Solution

1. Step 1: Write the proportion equation
   69.42 : 103.96 = 53.15 : x
2. Step 2: Convert to fraction form
   69.42/103.96 = 53.15/x
3. Step 3: Cross multiply
   69.42x = 103.96 × 53.15
4. Step 4: Simplify right side
   69.42x = 5,525.47
5. Step 5: Solve for x
   x = 5,525.47/69.42
6. Step 6: Final answer
   x = 79.59