Finding the Fourth Proportional to 73.16, 109.82 and 42.78

Step by Step Solution

1. Step 1: Write the proportion equation
   73.16 : 109.82 = 42.78 : x
2. Step 2: Convert to fraction form
   73.16/109.82 = 42.78/x
3. Step 3: Cross multiply
   73.16x = 109.82 × 42.78
4. Step 4: Simplify right side
   73.16x = 4,698.10
5. Step 5: Solve for x
   x = 4,698.10/73.16
6. Step 6: Final answer
   x = 64.22