Finding the Fourth Proportional to 72.57, 108.69 and 42.06

Step by Step Solution

1. Step 1: Write the proportion equation
   72.57 : 108.69 = 42.06 : x
2. Step 2: Convert to fraction form
   72.57/108.69 = 42.06/x
3. Step 3: Cross multiply
   72.57x = 108.69 × 42.06
4. Step 4: Simplify right side
   72.57x = 4,571.50
5. Step 5: Solve for x
   x = 4,571.50/72.57
6. Step 6: Final answer
   x = 62.99