Finding the Fourth Proportional to 72.95, 109.33 and 42.55

Step by Step Solution

1. Step 1: Write the proportion equation
   72.95 : 109.33 = 42.55 : x
2. Step 2: Convert to fraction form
   72.95/109.33 = 42.55/x
3. Step 3: Cross multiply
   72.95x = 109.33 × 42.55
4. Step 4: Simplify right side
   72.95x = 4,651.61
5. Step 5: Solve for x
   x = 4,651.61/72.95
6. Step 6: Final answer
   x = 63.76