Finding the Fourth Proportional to 70.58, 105.69 and 53.42

Step by Step Solution

1. Step 1: Write the proportion equation
   70.58 : 105.69 = 53.42 : x
2. Step 2: Convert to fraction form
   70.58/105.69 = 53.42/x
3. Step 3: Cross multiply
   70.58x = 105.69 × 53.42
4. Step 4: Simplify right side
   70.58x = 5,645.43
5. Step 5: Solve for x
   x = 5,645.43/70.58
6. Step 6: Final answer
   x = 79.99